[api] having an index on cache_lines should make it bit faster

Mainly slows down the event processing
[api] call the event jobs delayed

As we keep a transaction open for 1000 events, we lock quite some tables
to parse issues, clear cache lines, ...
[backend] make sure not to include our own build results in meta calculation
[api] Adjustments in commits feed to be more human and aggregator friendly
[api] add db index to ProjectLogEntry#datetime
[api] ProjectLogRotate marks ALL old events as logged
[api] add errbit_host line to options.yml.example again
[dist use only local socket and no port for mysqld during test suite run
[backend] refactor filter_exports function
[backend] rename %old to %oldids

... so we can have %old and %new for the package data
[backend] save meta into .meta.success

so we can rebuild :full with the correct meta
[backend] add importarch parameter to update_dst_full

In the fututre we want to store imports next to the normal binaries
in the package directory.
[backend] refactor add_binary_to_full and del_binary_from_full
[backend] set suf also for the old repo, don't delete unknown packages
[backend] do not publish non-dot files, fix bug in exporter
[backend] src server: use ajax for remote cpio source download
[api] also save the obs_url
[api] make the latest_commits feed valid and link it

w3 demands an id and feeder.co requires a link to be present to make use of it
[webui] fix the links to 'Owned Packages'
[backend] implement load forwarding to the master dispatcher