replace got_repo_get_gitconfig_extensions with got_repo_has_extension got_repo_get_gitconfig_extensions is only used in gotadmin to check if the preciousObjects extension is active; let's replace it with a function that just checks whether a certain extension is active. It simplifies future changes to the extensions handling. ok stsp@

fix building of few regress after got_object_id_hex was introduced and used in error.c, the building of delta, deltify and path failed due to missing symbols. Spotted by stsp and tracey, ok stsp

got_object_open: copy whole id not just the sha1 ok stsp@

introduce got_error_checksum ok stsp@

introduce got_object_id_hex to replace some got_sha1_digest_to_str() It's an analogous to got_object_id_str but writes to the given buffer. ok + improvements by stsp@

rename a function for clarity

add a TODO item regarding missing client-side pack content verification

typo and style(9): do not use function calls in initialisers. ok stsp@

fix mistaken instances returning NULL instead of err While here, for consistency, check dup() return value for -1 rather than < 0. ok stsp@

fix missed doc update of new 'got fetch' behaviour ok stsp@

delete unused code serializes an id to a local buffer before before returning. ok stsp

yet another gotwebd TODO writing everything down to avoid forgetting stuff...

one more TODO for gotwebd

add an arrow after "more" as per jamsek suggestion

gotwebd: fix briefs/tags navigation overlap Introduces a separate field for the "next" button (now called "More") and adjusted the CSS/HTML so it's used. Finally, drops the old code used to handle the pagination for the BRIEFS/COMMITS cases. Needs a small hack for the time being, setting the action to TAGS. This is due how qs->action is changed in gotweb.c while handling the request. ok jamsek