android-plot experiments in goal overview
Merge branch 'master' of https://github.com/mwagnurr/ToDoMorrow
changes in GoalOverview layout and graph plot

changes in TaskDAO
beginning of tasklist refactoring (no changes in TaskList yet)
Merge branch 'master' of https://github.com/mwagnurr/ToDoMorrow
fixes correct display of task checkboxes (changes in TaskListFragment and TaskDAO)
refactoring in TaskList and TaskListFragment

changes in TaskDAO and database
addition of strings for options menus