Removed "Device not enabled, yet" dialog for new devices.

Background: the free version is now limited to 2 allergens, so there no
longer is a need to restrain the user in other ways.
added network info button to synchronize activity,
improved network error handling
Merge branch 'devel' into no-device-blocking

Conflicts:
	gen/com/srsoftware/allergyscan/R.java
altered network exception handling
altered first-time downloading of allergens:
now done blocking
removed synchronization after containment update:
autosync locks the database, which may in turn lead to an app crash when
another item is edited and the app tries to write to the database