[backend] also implement dbg/src filtering in the repserver's getbuildinfo function
[webui] the cool kids use haml, we should too
[webui] improve the subprojects view code a bit and write test cases

fixes #204 (well, not really - it just proves it was fixed before)
[api] do not stop delivering notifications if one is problematic

the OBS ran into a situation where several delayed jobs tried to deliver
notifications and always stopped when they ran over an even that was already
sent by another - and stopped there. But this caused a race to go on
[activexml] don't bother deflate for webui->api communication

(as long as we still do that)
[webui] bring back the build result in requests

fixes #475
[webui] fix issue disable in request

fixes #472
[webui] don't reuse users from Thread.current
Fix issue#464: search ignores non existent issues
[webui] specify url method
[api] ignore missing templates

it happens now more often as people query XML routes with web browsers
[webui] test 'request deletion' in both package and project