Remove the rest of cgi->param() and cgi->cookie() calls
Code style for the rest of *.cgi
Bugzilla::Group: code style
Redesign bug edit form.

* Use "label \n field" instead of "label \t field".
* Use divs instead of tables for layout.
* Make page scale from 4 columns down to 2 and then to 1 using media queries.
* Reflow 4 custom field columns with JS to balance their height.
Bugzilla::Template: code style, remove some rarely used subs

* Remove filters inactive, obsolete, closed
* Remove global subs: use_keywords, bug_fields, comment_indexes