fix styles of /rest/
/status/perfdata2 : Fix styles
Experimental support for background tasks
/misc - Code inspections and cleanup
objectbrowser/forms - code cleanup in pynagform

Fix a bug where singlechoicefields (like check_command)
get the value "None" when nothing is selected.

Fix a bug where certain multichoicefields (like host_name on services)
are ignored when all values are removed.