Changing project proprieties so it compiles with android 18,

which comes out of the box with android SDK now.
Extracting the arrays from strings.xml
Removing unused method
Fixing the build path,
removing unused links.
Merge pull request #236 from arthurbenemann/ProjectFix

Fixing build path errors
Merge pull request #237 from arthurbenemann/strings

Fixing problems with strings.xml
Changing the place where DroidPlanner store it's data to a more public place.
Add a field in the settings screen to show the default folder where DroidPlanner store it's data.
Merge pull request #241 from arthurbenemann/DataStorage

Data storage folder
Reverting the DroidPlanner folder to the root directory, since it would upset a lot of users.

Reverts part of the changes in issue #241 because it didn't fixed the issue.
Change project target to the new android API (18)
Preparing for release v0.12.3