Brings in improved accuracy of function prototypes in hunk headers.

The limit feature is more than just a search operation, tog's man page has been updated accordingly.

This command acts like a search operation, and the display should reflect that.

Make work tree diffs of local changes on disk display the file mode of new added files like other versions of `got diff` currently do. ok stsp@

We can assume that the querystring was initialized when we reach gotweb_render_header. ok tracey@

Reported by stsp on IRC: got patch failed to set the x-bit for a new file despite got diff recording mode 755. Parse got and git diffs for this data and set file modes accordingly. Tweaked with hint from op. ok stsp@

Similar to `git init -b`. Includes a change to `got import` behaviour such that "main" is no longer hardcoded by default; instead, we import to the branch resolved via the repository's HEAD reference unless `got import -b` is used, and only if HEAD cannot be resolved to a branch do we fallback to "main". includes fix plus ok from stsp@