minor ui tweak
reset pending subscription request
added missing status messages after message scroll
no dns retry after nosrv error
fixed an 'activity has leaked window'
sending initial ping before going online after login/resume to ensure that all presences and messages have been loaded
end otr session instead of only resetting
fixed #510
MUC: differentiated a few more errors.
Merge pull request #523 from betheg/leaked_window

fixed an 'activity has leaked window'
Merge pull request #524 from betheg/muc_errors_conditions

MUC: differentiated a few more errors.
fixed rare npe
made conversations overview list always 1/3 on tablet devices
only delivery get and set iq packets to unhandled iq listener. only create jingle packets with type=get or set
refactored muc bookmark to extend element. keep all elements the server or other clients added before
muc options clean up
fixed npe
work around for message scroll bug
cleanung up the scroll fix a little
fixed regression of not showing status message