Update to 2.1.0

Changelog:
elease 2.1.0 December 3rd 2015

    GUI: Added a separate view for not synced items, ignores, errors
    GUI: Improved upload/download progress UI (#3403, #3569)
    Allowed sharing with ownCloud internal users and groups from Desktop
    Changed files starting in .* to be considered hidden on all platforms (#4023)
    Reflect read-only permissions in filesystem (#3244)
    Blacklist: Clear on successful chunk upload (#3934)
    Improved reconnecting after network change/disconnect (#4167 #3969 ...)
    Improved performance in Windows file system discovery
    Removed libneon-based propagator. As a consequence, The client can no longer provide bandwith limiting on Linux-distributions where it is using Qt < 5.4
    Performance improvements in the logging functions
    Ensured that local disk space problems are handled gracefully (#2939)
    Improved handling of checksums: transport validation, db (#3735)
    For *eml-files don't reupload if size and checksum are unchanged (#3235)
    Ensured 403 reply code is handled properly (File Firewall) (#3490)
    Reduced number of PROPFIND requests to server(#3964)
    GUI: Added Account toolbox widget to keep account actions (#4139)
    Tray Menu: Added fixes for Recent Activity menu (#4093, #3969)
    FolderMan: Fixed infinite wait on pause (#4093)
    Renamed env variables to include unit (#2939)
    FolderStatusModel: Attempt to detect removed undecided files (#3612)
    SyncEngine: Don't whipe the white list if the sync was aborted (#4018)
    Quota: Handle special negative value for the quota (#3940)
    State app name in update notification (#4020)
    PropagateUpload: Fixed double-emission of finished (#3844)
    GUI: Ensured folder names which are excluded from sync can be clicked
    Shell Integration: Dolphin support, requires KF 5.16 and KDE Application 15.12
    FolderStatusModel: Ensured reset also if a folder was renamed (#4011)
    GUI: Fixed accessiblity of remaing items in full settings toolbar (#3795)
    Introduced the term "folder sync connection" in more places (#3757)
    AccountSettings: Don't disable pause when offline (#4010)
    Fixed handling of hidden files (#3980)
    Handle download errors while resuming as soft errors (#4000)
    SocketAPI: Ensured that the command isn't trimmed (#3297)
    Shutdown socket API before removing the db (#3824)
    GUI: Made "Keep" default in the delete-all dialog (#3824)
    owncloudcmd: Introduced return code 0 for --version and --help
    owncloudcmd: Added --max-sync-retries (#4037)
    owncloudcmd: Don't do a check that file are older than 2s (#4160)
    Fixed getting size for selective sync (#3986)
    Re-added close button in the settings window (#3713)
    Added abililty to handle storage limitations gracefully (#3736)
    Updated 3rdparty dependencies: sqlite version 3.9.1
    Organized patches to our base Qt version into admin/qt/patches
    Plus: A lot of unmentioned improvements and fixes


(ryoon)