got: implement diffstat for got log and tog diff view Add new got_diff_blob_cb() implementation to compute added/removed line metrics for a given diff. This enables displaying a diffstat with 'got log -d'. As per suggestion from stsp, change tog diff view to display the diffstat by default. ok stsp@

backout 169b163113a6db9878c9166aa05fbd30d05eb832 pushed by mistake, wasn't reviewed.

template.7: fix double spaces diff from Josiah Frentsos and clue from tb@, thanks! (I can't read.)

template: bump date in manpages

template.7: Add a missing \& where needed based on a diff by Josiah Frentsos, thanks!

template.7: Use -width instead of -indent diff from Josiah Frentsos, thanks!

template.7: use An instead of Ar in AUTHORS diff from Josiah Frentsos, thanks!

template.1: Use -std with Ex diff from Josiah Frentsos, thanks!

gotwebd: templateify gotweb_render_diff To avoid calling functions from got_operations.c directly from a template (which would hide the error), change got_output_repo_diff into got_open_diff_for_output that returns a file with the diff in it, to be then rendered by the template. got_gotweb_flushfile needs to be exposed then. It also bundles a smaller change: the `label' argument of got_repo_match_object_id is optional and not used, so just pass NULL there.

template: specify which C loop

template: add `while' construct

switch gotd.conf syntax from 'unix_socket' to 'listen on' ok op@

template: drop tmpl.c from SRCS was added there mistakenly. it's not part of the "compiler", it's part of the "user library" and provides useful functions for the consumers.

gotd: delete unreachable code after gotd_shutdown()

gotwebd: urlencode also the double quote character URLs are embedded as part of the HTML and, while it seems legal from RFC3986 to leave that character unquoted, we need it quoted to avoid breaking the HTML output. ok tracey@