add gotd regress gotd.conf to CLEANFILES to remove it during 'make clean'

add obj/pages.c to CLEANFILES in gotwebd's Makefile

license copyright++

remove TODO items related to indexing ref-deltas

fix indexing of pack files which contain ref-deltas ok jamsek

refactor got log -d and tog diffstat to compute diff once This eliminates the previous performance cost by making 'got log -d' and tog diff view compute the diffstat while building the diff in a temp file like we do with 'got diff -d'. Also, keep the current 'got log -d' UI as per stsp's suggestion. ok stsp@

fix diff and log diffstat tests broken in 65dedee0a2cd I failed to update regress when changing the diffstat summary line in the previous commit to use a singular noun after 1. ok op@ and stsp@

update gotd TODO items

don't use plural noun after 1 in diffstat total Use singular form when appropriate; for example, turn the top into the bottom: 1 file changed, 1 insertions(+), 1 deletions(-) 1 file changed, 1 insertion(+), 1 deletion(-) ok op@

gotwebd: delete now unused code gotweb_escape_html and gotweb_link are now completely unused. ok jamsek

gotwebd: inline got_output_file_blob into gotweb_process_request ok jamsek

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