added the first of two fragment-classes => EditFragment
implemented the OptionList of the EditTab
initialy implemented the class DBHelper
implemented first part of the learnFragment including the listview of the stacks, that gets its data from the database
modified tables in database
added layout_file for the choice of the boxes
added a box-choice-view and the learning-mode
- the box-choice works
- in learning mode, its always shown the first flashcard
fixed some bugs in learning mode (seems to work properly now)
- added an informational textview in to learning view that contains the actual boxnumber and cardcount
- implemented a db-method that updates the field 'box' of a given card
added some coments