[dist] try to get it building on SLE 12
[webui] Sort the packages in projects
[api] raise dependency version of ruby_parser
[api] detect pre-defined reviews and avoid history elements for them
[ci] provide fixtures for new history_elements
[backend] worker: check that the main builder process stays alive
[api] fix loading of fixtures
[backend] add experimental 'slepool' hack to rename published kiwi repos
[ci] better way to fill fixtures

thanks coolo!
[backend] add slepool saftey mechanism

We don't want to have overwrites if multiple packages are
published by mistake...
[api] do not use bs_request_histories in search
[api] filter right history elements for search and test it
[api] fix default priortity value for old requests
[api] make request history optional

Old clients may break on new history layout, so we show it only with a "withhistory"
parameter now.

Adds also the option to include the review history embedded already.
[backend] add a view=publishedpath route so that the api no longer needs to guess it
[webui] Show request priorities