[Clas12_software] gemc and JLAB_VERSION upgrades

[Maurizio Ungaro]

gemc version 2.2 has been released.

Main new features:
Both solenoid and torus fields coexist at the same time  
Step by Step infos can now be written out
Fixed “signal” display for some variables. 
Improved GUI
More variables in signals GUI
Slices now possible in camera GUI
Explode button in camera GUI
qt5, geant4 10 support
The release notes can be found here.

Mac users can enjoy the dmg app from gemc.jlab.org "downloads", for 10.8 and up.
Notice however that starting with the next version of gemc, only Yosemite and up will be "app" maintained. 

This gemc release is part of a more general JLAB_VERSION release of libraries used in common across the lab (https://data.jlab.org):

Upgraded JLab software libraries are installed on the CUE machines.  JLab Version 1.2 includes:

- QT:         4.8.5 —> 5.3.2 
- geant4:   4.9.6.p03 —> 10.00.p03
- gemc:     2.1 —> 2.2
- scons_build_system: 1.1 —> 1.2
- ROOT:  5.34.21
- CCDB (new): 1.03

The "production.csh", currently pointing at 1.1, will be updated next Tuesday, Feb 10 to point to 1.2. 

We now have 3 versions of libraries:

- 1.2 
- 1.1 
- 1.0

Details on what's in each version can be found here.

Users can quickly setup the environment as before:

source /site/12gev_phys/production.csh 
source /site/12gev_phys/devel.csh

Users can also select custom versions using the JLAB_VERSION env variable:

setenv JLAB_ROOT /site/12gev_phys
setenv JLAB_VERSION  1.2
source $JLAB_ROOT/$JLAB_VERSION/ce/jlab.csh

Devel will include among others geant4 v 10.1, qt 5.4 and evio 4.3 support. It may include ROOT 6 support.
Starting with devel, CentOS 62 machines will no longer be supported, as they're replaced by CentOS 65.



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