2017-08-28 LHCbSys v42r6

This version uses Gaudi v28r2 and LCG_82 with ROOT 6.08.06.

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p> This version is released on 2017-patches branch.

Updates for Git CondDB support

[MR !811] Removed date from comments in conditions XML files
See LHCBPS-1744

[MR !800] Git CondDB updates and fixes
- Support Git CondDB layout as input to copy_files_to_db.py
- Use metadata in tag messages to find latest datatype tags
- Add commit id to tag reported in event headers

[MR !698] CondDBBrowser updates
- Use Qt5 by default
- Small fixes to absorb differences between PyQt4 and PyQt5
- Add support for Git CondDB (read-only), see LHCBPS-1713
- Closes LHCBPS-1502

[MR !765] Modifications to RunChangeHandler to force the name change of conditions

Changes to persistency to fully support TurboSP

[MR !819] Add (un)packing for {Velo,ST}Cluster containers

[MR !818] Add persistence of PackedClusters for PackedDataWriter
Also, add packing support for PackedCaloAdcs for PackedDataWriter(Decoder) for TurboSP.

[MR !808] Add support for (un)packing CaloDigit containers

[MR !807] Add PackedCaloDigits to HltPackedDataWriter(Decoder)
Allows persistence of PackedCaloDigits for TurboSP

[MR !767] Allow offline use of HltSelReportsWriter

Bug fixes

[MR !854, !850] Stop Turbo-only Calo objects being used in TISTOS decisions
See LHCBPS-1746 for background.

[MR !841] Fix error status OR in Calo decoders

[MR !835] Fix misuse of a function as variable

[MR !827] Fix boolean return in DeCalorimeter functions

Changes to tests

[MR !838, !775] Increase VMEM mergesmallfiles test failure threshold to 1.5GB, to avoid false alarms