gotwebd: add an RSS feed for the tags ok tracey@

gotwebd: drop unused path parameter from got_get_repo_{owner,age} ok jamsek

make got_commit_graph_iter_next use caller-provided storage for the id and adjust the callers. discussed with and ok stsp@

gotwebd: fix briefs navigation broken in 4a9629420 got_get_repo_commits iterates over the commits and build a queue for later display. My previous memleak fix moved the TAILQ_INSERT_TAIL *before* the logic to exit the loop and so it broke the pagination. This fixes it by delaying the insertion into the queue, but also by moving the check for the "previous" button after we've opened the commit. ok tracey

gotwebd: percent-encode generated URLs This adds a new helper function `gotweb_link' that outputs an HTML link with the parameter correctly escaped. ok stsp@

gotwebd: plug leak in got_output_repo_tree

gotwebd: fix usage of the commit graph iter got_get_repo_commits mixes ids allocated on the heap and the one returned by the iter_next in the same variable, and then even attemp to free it. This is both a leak (we loose the pointer to the previously allocated id) and a possible invalid free since the object id pointer returned by the graph iterator is not to be passed to free(3). part of a bigger diff that's ok stsp@

gotwebd: free obj_id and reflist in got_output_file_blame ok stsp@

gotwebd: got_output_file_blame: free lines on error path ok stsp@

gotwebd: free eline in got_gotweb_blame_cb loop ok stsp@

gotwebd: drop superfluous check commit_id is not NULL if got_repo_match_object_id returned successfully. ok stsp@

gotwebd: kill unused id_str in got_output_repo_tree ok stsp@

gotwebd: avoid extra strdups in got_output_repo_tree ok stsp@

gotwebd: avoid extra variable in got_output_repo_tree in_repo_path was used only to build a path, it's then assigned to path (which is NULL at that point.) Just asprintf into path. ok stsp@

gotwebd: plugs leaks in got_get_repo_commits call got_get_repo_commit only once and avoid leaking the field of repo_commit at each loop iteration. ok stsp@