Add jaavdoc for ItemsDbHelper
Add TODOs for the two Activity classes
ItemDescriptionEntryActivity.onCreate: Use String.isEmpty to check if string is empty, instead of checking length
Revert "ItemDescriptionEntryActivity.onCreate: Use String.isEmpty to check if string is empty, instead of checking length". Only available on Android API level 9 and later

This reverts commit 0cfc33e2b3ef56c1faa7bd7b2520ba3df8779be4.
Add TODOs in ItemDescriptionEntryActivity
Add TODOs in ChecklistActivity
ChecklistActivity: Add Override annotations for two methods
ChecklistActivity: Reorganize imports