check if file exists on creation now works and opens probandencode-screen if it does not exist
(hopefully) finished the basic elements of the application and put all missing functionalities in ToDos
structural changes to the way we deal with the user times
Merge branch 'master' of https://github.com/NdrsPtrw/SocialDoc

Conflicts:
	.idea/workspace.xml
	out/production/SocialDoc/SocialDoc.apk
	out/production/SocialDoc/SocialDoc.unaligned.apk
	out/production/SocialDoc/de/ovgu/swe_projekt/socialdoc/Control.class
	out/production/SocialDoc/de/ovgu/swe_projekt/socialdoc/MainActivity.class
	out/production/SocialDoc/de/ovgu/swe_projekt/socialdoc/UserData.class
	src/de/ovgu/swe_projekt/socialdoc/MainActivity.java
added basic structure for error messages
Merge branch 'master' of https://github.com/NdrsPtrw/SocialDoc
more changes to error handling