duplicates.cgi: Add "Resolution" and "Priority" columns

...and remove less used "OS" column. File is a copy of upstream
4.4 file (do not apply on 4.2) at
http://bzr.mozilla.org/bugzilla/4.4/view/head:/template/en/default/reports/duplicates-table.html.tmpl
Our custom changes are marked with "Wikimedia" in the source code.

Bug: 56253
Bug: 58749
Change-Id: I7c13f73c07357a0d0d37f2650937355ffaad4be6
Merge "duplicates.cgi: Add "Resolution" and "Priority" columns"