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returns undef if none
 
=head2 abs_cgibin()
 
tries to find path to cgi-bin
may warn and return undef
 
=head2 DOCUMENT_ROOT()
 
assumes this is a website and returns document root
if $ENV{DOCUMENT_ROOT} is not set, it tries to test and guess for it
on failure returns undef
 
=head2 script_rel_path()
 
returns script's relative path to DOCUMENT_ROOT()
warns and returns undef on failure
 
=head2 script_rel_loc()
 
returns the path of the directory the script resides in, relative to DOCUMENT_ROOT()