alpha

The alpha release of the GeantV prototype. For a detailed description…

… see: https://gitlab.cern.ch/GeantV/geant/blob/0.3.0/README

First working version including scheduler v3, new EM physics, new use…

…r interfaces, documented user application example.

runCMS works (one single error) on CPU and GPU.

geant-133:run full test

Last stable tag before merging in the new geometry navigation interfa…

…ces.

Following current VecCore naming convention (see VecGeom devel branch)

First weekly tag

tag for GUTracking

Merge branch 'swenzel/newfindvecgeom'