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    - Deprecate xyplot "histogram" subtype and default to "boxes".
    - Add xyplot overlay feature.
    - Fix gene glyph so that it collapses appropriately when bump explicitly
      set to 0.
    - Highlighting now works on features contained within groups.

2.24
    - In feature file configuration sections, allow a tag to contain ":".
  
2.23
    - Workaround a problem in BioPerl 1.069 which prevents FeatureFile from rendering
      properly. Fixed in 1.06902 and higher.
    - Fix issue which caused the track bgcolor property to be ignored in some cases.

2.22
     - Changed package "Math" to "Bio::Graphics::Math" to avoid CPAN namespace
       collisions.

2.21
     - Changed almost all occurrences of attributes() into eval{$feature->get_tag_values()}
       to achieve compatibility with Bio::SeqFeatureI. One exception is in spectrogram glyph,
       which depends on the non-standard behavior of attributes() when called with no args.
 
2.20
     - Fixed the various "wiggle" glyphs so that scale is always drawn even if no data is to be
       shown in selected region.

2.19
     - Made "record_label_positions" default to "true" for wiggle_density plot. This activates
       a fixed-position floating label when density plots are being shown in GBrowse.
     - Fixed a bug in wiggle_xyplot that prevented plot from being drawn in SVG renderings.

2.18
     - Made handling of min/max scale calculations consistent across all xyplot glyphs and their derivatives.
     - Added following autoscale options to wiggle_xyplot and wiggle_whiskers: "z-score" to rescale data such
       that mean is zero and values are standard deviation-fold change; and "clipped_global" to scale to
       global mean +/- some number of standard deviations indicated by "z_score_bounds".
     - Added "z_score_bounds" option to wiggle_xyplot and wiggle_whiskers to control how many standard
       deviations to show.
       

2.17
     - In segments glyph, fixed bleedover of "deletion" color when a deletion is followed by an insertion.
     - In segments glyph, fixed the display of inserted bases such that they will not bleed into a
       preceding deletion.
     - In segments glyph, fixed the mismatch color highlighting when the alignment is to the negative
       strand.
     - In segments glyph, fixed the default colors for mismatch, insertion and deletion.
     - In segments glyph, fixed treatment of soft clipping as an "insertion"; this will avoid the insertion
       color from appearing at the ends of soft-clipped reads.
     - In gene glyph, fixed occasional linking of two neighboring transcripts.
     
2.16
     - Distinguish between "chromosome" and "global" autoscaling in the xyplot and density glyphs.
       Global autoscaling only works when underlying database is bigwig.
     - Regularized options which select glyph subtypes with an option named "glyph_subtype".

2.15
     - Fixed documentation bug: sort_order options to sort by feature length should be
       "longest" and "shortest" rather than "longer and "shorter".
     - Improved layout algorithm, achieving speedup of ~4x on busy tracks.
     - Fixed font color problems when displaying multiple alignments at DNA level in
       the segments glyph.
     - Fixed problem of DNA alignment indels disappearing from view when they span entire region.
     - Fixed problem of mismatch and indel colors leaking off ends of feature arrows.

2.14
     - Fixes to the way that "fast bump" works so that tracks never fast bump.
       This fixes problems when using groups to simulate subtracks, and the
       groups are of different heights.
     - The group glyph will now add the group labels to the list of track keys
       stored in the panel and retrieved from the call to $panel->key_boxes().

2.13
     - Changed default namespace for callbacks to make them portable across freeze/thaw
       cycles.

2.12 Tue Aug 31 10:42:06 EDT 2010
     - Created a read_pairs glyph that contains the settings most often used for SAM paired end reads/mate pairs;
       this fixes the mate-pairs overlap bug.
     - xyplot glyph now obeys "flip" setting.

2.11 Tue Jun 29 15:37:03 EDT 2010
     - Cleaned up stylesheet-based rendering of features when the main glyph has a type of
     "hat" and subfeatures overlap with each other.  This occurred when rendering certain
     DAS sources.

2.10 Mon May 24 13:58:26 PDT 2010
     - Fixed a long-standing but rarely-seen bug in layout algorithm that
       caused some features to be displaced downward further than they should
       be.
     - Added support for labeling groups (on the left side). This is used by
       GBrowse to create subtracks.

2.09 Fri May 14 11:46:51 EDT 2010
     - Fixed Bio::Graphics::FeatureFile cached callbacks so that they are evaluated
       in the same package as they were when the file was originally evaluated and cached.

2.08 Thu May 13 17:06:29 EDT 2010
     - Fixed Bio::Graphics::FeatureFile init_code so that it is reinvoked when retrieving a 
       cached copy of parsed featurefiles.

2.07 Sun May  9 11:56:10 EDT 2010
     - Added FeatureFile->cachedir argument to help with GBrowse tests.

2.06 Wed May  5 00:51:00 EDT 2010
     - Segments glyph now displays correct mismatch color for sequences that begin or end with soft clips.
     - Indels displayed in correct color when indel begins or ends outside current visible region.

2.05 Identical to 2.04.

2.04 Sun Apr 18 17:26:01 EDT 2010
     - Segments glyph now smarter about fetching reference sequence; this improves performance
       on multiple alignments.
     - -show_mismatch option now takes following arguments: 0 (false), "always", "base level" (draw only
       when DNA is in view), or a number, in which case mismatches will only be drawn when the length
       of the window is <= that number. For compatibility, a value of "1" is the same as "base level."
     - Fixed display of protein sequence in genes when -draw_protein is true.
     - Fixed display of long deletions in segments glyph base-pair alignments to avoid drop-out of
       sequence from the right end of the alignment following deleted region.
     - Fixed display of insertions in segments glyph base-pair alignments so that the length