gitweb: remove unused css classes Looks like they were unused since the very introduction of gitweb theme in 385b8872b8e3.

monoblue: also highlight target line on annotate and comparison pages Clicking on a line link on pages that show any kind of file contents (including diffs) should highlight that line, and in monoblue it works when there's a <pre> element (e.g. diff), but pages that use <table> element (annotate and compare) need this css class. It matches and highlights linked (":target") table rows. This line is pretty much copied from gitweb theme.

paper: remove css hack that made .branchname look like .branchhead There's a visual difference in hgweb between one changeset that is the tip of its branch and another that simply belongs to that branch. But paper theme ignored this difference on changeset page and used to always use "branchname" css class, be that changeset the tip of its branch or not. That has been recently fixed, so this piece of css is not needed anymore.

hgweb: rename the main attribute of instabilities Let's make "instabilities" list contain items with "instability" key as opposed to "name" key. This way it's more explicit and more consistent with the log command-line template.