'mandatory' property to a per-subfield 'tag_mandatory' template parameter,
so that addbiblio.tmpl can distinguish between mandatory subfields in a
mandatory tag and mandatory subfields in an optional tag
Not-minor factoring in acqui.simple/addbiblio.pl to make the if-else blocks
smaller, and to add some POD; need further testing for this
Added function to check if a MARC subfield name is "koha-internal" (instead
of checking it for 'lib' and 'tag' everywhere); temporarily added to Koha.pm
Use above function in acqui.simple/additem.pl and search.marc/search.pl
Create output_html_with_http_headers function to contain the "print $query
->header(-type => guesstype...),..." call. This is in preparation for
non-HTML output (e.g., text/xml) and charset conversion before output in
the future.
Created C4/Interface/CGI/Template.pm to hold convenience functions specific
to the CGI interface using HTML::Template
Modified moremembers.pl to make the "sex" field localizable for languages
where M and F doesn't make sense
