Fixed root warnings at compile time

See merge request !86

merge master to future

See merge request !85

By declaring the root library as a system one in the CMakeLists.txt

Documentation and dependencies for v43r0 release.

See merge request !83

Place Moore RecSummary in a stream-dependent location

See merge request !79

This places Rec/Summary in stream-dependent location, which is useful
for TurCal productions where the Brunel summary already exists at
/Event/Rec/Summary, so the Moore summary must go somewhere else.

Addresses !78 (comment 295430).

Handle missing Hlt2 SelReports in Tesla

See merge request !78

Occasionally, HLT2 did not write `Hlt2/SelReports` for very busy
events. Previously, the `TeslaReportAlgo` was skipping such events
happily. Here we restore this behaviour, such that if
`Hlt2/SelReports` cannot be decoded, no event is written out.

Use MergedConfDB as dependency in the Turbo cache

See merge request !77

Ideally, this would already be done in the main cmake file in LHCb.

Fixes for v42r5 release

See merge request !76

Prepare v42r5 release

See merge request !75

Tesla configuration house-keeping

Closes LHCBPS-1721

See merge request !73

Makes Tesla output more closely resemble Stripping output.

Closes LHCBPS-1721.

PackParticlesAndVertices may create it.

By 'offline' we mean 'the raw event has been played around with after
Moore', which normally means we are processing Brunel output.

Method taken from  DaVinci's Configuration.py:

    https://gitlab.cern.ch/lhcb/DaVinci/blob/77d3e66ed062777c73e5071fe5eb8e68d889c220/Phys/DaVinci/python/DaVinci/Configuration.py#L305-328

Removed versions from packages (in CMakeLists.txt).

See merge request !74