gotwebd: templateify gotweb_render_blame ok and tweak from jamsek

zap empty line

gotwebd: templateify gotweb_render_summary ok jamsek

gotwebd: bubble up got_get_repo_tags This bubbles up the call to got_get_repo_tags from gotweb_render_tags to its caller, gotweb_process_request and gotweb_render_summary. It helps simplifying gotweb_render_summary and making it easier to templateify, but also helps in untangling a bit the code. At this point gotweb_render_tags becomes just a wrapper to gotweb_render_tags_tmpl so switch completely to it. ok jamsek

gotwebd: templateify gotweb_render_branches no functional change intended. Bubble up the allocation of the reflist from gotweb_render_branches to gotweb_render_summary (its only caller) and rewrite it as a template. ok tracey@

got: style(9) and cleanup failure leaks lib/diff.c Spotted while implementing diffstat plus one introduced with diffstat code. Don't leak 'change' on got_pathlist_append() error. And don't leak modestr{1,2} and l{1,2} char pointers in diff_blobs() and got_diff_tree(), respecitvely. Regarding modestr leaks, rather than free at all error return points, use op's suggestion to lift modestr vars to function scope. ok op@

got: set error on asprintf() failure ok op@

replace malloc+memcpy with strndup. no functional change intended ok stsp@

got.1: Add example which lists recently modified branches. I use this a lot.

use just one pointer variable to keep track of a client's repo process ok op@

update client state tracking in the gotd parent process The session process takes over the old state definitions under a new name ("session state"). The parent only needs to keep track of whether a client has been granted access, so it only uses two states: NEW, and ACCCESS_GRANTED which is set as soon as the auth process has granted repository access and before the session and repo_read/repo_write children are started. Because 'gotctl info' can no longer observe the session state remove support code for printing it. ok op@

gotd: delete trailing blanks spotted while re-reading

gotwebd: show committer instead of author in BRIEFS

gotwebd: use from/via in gotweb_render_commits too like the previous, show also the committer if different from the author.

gotwebd: make commit page more like `got log' / tog - drop the "diff commit1 commit2" header; it's already showed in the body of the diff. - hide the tree id (not that useful to show.) - show the committer if different from the author. - use From/Via for Committer/Author. discussed with jamsek, stsp, tracey ok jamsek tracey