Preparing for migration.
Added new version but migration fails :(
move back to version 11
Still trying to get a model migration to work.
modernised objective c
Removed spare model 5 and updated project
Update live update field
back to version 11 since migration is still broken
Set default value for doLiveUpdate flag.
Return only the document model. If we leave core data to it's own devices, it will merge all models in the bundle. Not what we want!
Check the model for compatibility to the store being loaded, and if it's not compatible, try to repair it.
move to model version 12
Control over live update button is now locally handled via delegate methods.
live update is now a property settings state. We implement the delegate settings to interact with the pdf viewer.
handle saving and restoring of pdf thumbs and live update states.
Merge branch 'master' into newPersistence

Conflicts:
	TeXnicle.xcodeproj/project.pbxproj
Minor UI updates