GitLab

(cherry picked from commit 3827c744)

make edge identifiers size_t + fix arguments of mesh/getEdgeNumber + add mesh/getFaceNumber (these should be renamed...)

- CharacteristicLength -> MeshSize, geometry Lines->Curves

initializing the api now sets General.Terminal=1 (to print messages by default) and General.AbortOnError=2 (to throw an exception as soon as an error happens) - cf. #1043

- add "geo" versions of add/RemovePhysicalGroup in anticipation of move of "master" physical group definition in GModel (we will need to keep the built-in kernel defintion as well, since built-in CAD operations track physicals)
- more explicit mentions of CAD kernel in api docs