Make opml export work

Conflicts:
	AndroidManifest.xml
	src/net/alliknow/podcatcher/EpisodeActivity.java
	src/net/alliknow/podcatcher/model/tasks/StorePodcastListTask.java
Add export/import icons
Add file infrastructure for the file/folder selection dialog

Conflicts:
	AndroidManifest.xml
Make first version of file selection dialog work
Work on file dialog completed

Conflicts:
	res/values-de/strings.xml
	res/values-es/strings.xml
	res/values-fr/strings.xml
	res/values/strings.xml
Reset activity
Integrate file dialog and OPML export