Various fixes.

* Arsip: disable buttons if user not in group arsip.
* MainToolbar: fix menu loading of 'trans_transfer_berkas'.
* Pemindahan: reload store 'BerkasPindah' after submit success.
* Pemindahan: fix data not loading, use "Ext." prefix in String object.
* PemindahanRinciWin: disable store autoload-ing on BerkasPindah.
* data.berkas_pindah: use init.
* data.unit_kerja:
  - use init.
  - filter by user unit-kerja if user's group ID is not 1 and 3.
* index: add JS global variable for user group ID.
Arsip: button cetak label will be activated when grid Rak is selected.