add bug handling

Spelling and language fixes

As per https://oauth.net/2/
Tab removed from:

"Your search returned no files modified
+    <string name="file_list_empty_recently_modified_filter">Search returned no files modified the last 7 days.</string>
-        in the last 7 days."

/AutoUpload is now consistent with /InstantUpload

URGENT: fix list view by removing wrong breaks

Prevent NPE when disabling "storage permission" and then access auto upload

Clicking on link in activity list shows correct file/folder

codacy fixes: add break to switch statements

Transaction too large

Disable emulator as we currently do no instrumented tests

Sdcard: test if writable before offering it

Fix settings on android 4.x

Cancel pending thumbnail tasks

Enhance UI"Contacts backup" 

add link to fdroid

add dev version link to fdroid

- cancel all pending async tasks when leaving FDA: needs to be done by get.abort() as this is a blocking command and needs to be accessed directly