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This module implements a MatLab style AutoLoader for PDL. If an unknown
function C<func()> is called, PDL looks for a file called C<func.pdl>.
If it finds one, it compiles the file and calls the function C<func>.

The list of directories to search in is given by the shell environment
variable C<PDLLIB>. This is a colon-separated list of directories. On
MSWindows systems, is it a I<semicolon> -separated list of directories.

For example, in csh:

  setenv PDLLIB "/home/joe/pdllib:/local/pdllib"

B<Note>: This variable is unrelated to Perl's C<PERL5LIB>.

If you add a leading '+' on a directory name, PDL will search the
entire directory tree below that point. Internally, PDL stores the
directory list in the variable C<@PDLLIB>, which can be modified at
run time.

For example, in csh:

  setenv PDLLIB "+/home/joe/PDL"

will search /home/joe/PDL and all its subdirectories for .pdl files.

=head2 AUTO-SCANNING

The variable C<$PDL::AutoLoader::Rescan> controls whether files
are automatically re-scanned for changes at the C<perldl>
command line.

If C<$PDL::AutoLoader::Rescan == 1> and the file is changed