Fixes:
 * Avoid double slashes when constructing backend URLs
 * Remove all data belonging to deleted profiles
 * Update profile list when profile list data changes
 * Fixed "has sub-accounts" internal flag when refreshing account list
 * Fix icon for f-droid
 * Cleaner color selection dialog
 * Internal reorganization of database access. Should reduce the deadlocks significantly
 * Show accumulated balance in parent accounts retrieved via the JSON API