2.0.0 RC6

• Warning for corrupt accounts for 2.0.0RC users
• Fix NPE
• Fix for authentication/favorite/etc
• Show nice error message instead of crash via exception
• No : in git HTTPS link, GitHub, …
• resolves #1477 properly showing empty message after refresh when all …
• Fix duplicate string in contribute UI
• AutoUpload improvements
• Fix Snackbar on wrong login with old server
• RunUI operations in the UI thread
• Fix dialog bad token exception
• Fix fdroid link and add legal attribution
• Fix saveFileWithParentNPE
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