Fix bug #217
Allow inputs which cause intermediate invalid states & fix labels
Show no invalid date warning when user opens upload dialogue
Show error message if no issues have been created and user clicks "next"
Show error message if no granularity has been chosen before an action
Remove caching issue with the "next" button
Improve description of date input boxes
Merge remote-tracking branch 'matthias-ronge/issue_217' into feature-zm

Conflicts:
	Goobi/src/de/sub/goobi/forms/GranularityForm.java