[api] do not allow to create requests when virtual target package is not supported by type
[backend] adding support for z/VM virtualization
[backend] declare z/VM as secure virtualization
[backend] support caching of an repodata error state
[backend] add arch parameter to addrepo_remote
[backend] bugfix: make sure addrepo_alien does not mess with %prpnotready
[backend] refactor: split update_projpacks from get_projpacks
[backend] update remote project data with data from remotemap to reduce RPCs
[backend] fix comment
[backend] refactor: split clone_projpacks_part and postprocess_needed_check from delayedfetchprojpacks processing
[backend] refactor: split find_linked_sources from do_fetchprojpacks
[backend] report network errors in getprojpack as "interconnect errors"
[backend] first try of async scheduler, enable with $BSConfig::sched_asyncmode = 1
[backend] small syntax fix
[dist] add notes about systemd usage
[api] ensure that projects from watchlist have no invalid format
[backend] complete person XML description for backend (just for reference)
[api] project and packages names are not supported by the api, do not allow to create request references to them
[api] do not send source modification change notification, if request change fails
[backend] validate schema definitions in BSXML.pm with the examples