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mention that edges/faces are created w.g. with createEdges()/createFaces() or getKeysForElements() - cf. #1549

This is much more flexible and allows to tweak e.g. mesh sizes provided by fields (cf. #1375)

* store the entity tag on which the element is classified in the element cache: this allows to retrieve the entity when accessing the elements by tag (the entity pointer is not stored in MElement to limit memory use)
* enhance mesh/getNode() and mesh/getElement() API to return the entity on which the node/element is classified

With these additions one can e.g. identify entities (say, a meshed volume) by coordinate, by calling mesh/getElementByCoordinates() followed by mesh/getElement()

- keep track of value of omp_get_max_threads() in gmsh::initialize() in order to 1) reset the number of OpenMP threads in gmsh::finalize() and 2) use that value when setting General.NumThreads=0 (cf. #1356)
- only append to an environment variable if the value to append is not already in the variable

new argument to reparamMeshVertexOnFace to determine if it should fail on seams, or just return one of the 2 parameters

(cherry picked from commit 80964422)

Split 'std::vector< std::pair< int, int > > keys' into 'std::vector< int > typeKeys' and 'std::vector< std::size_t > entityKeys'

use two optional vectors to specify the elements and the partitions in mesh::partition() instead of a vector of pairs: it's more in line with what we do elsewhere in the api

if a mesh already exists, make ReorientMesh and setOutwardOrientation() change its orientation in addition to setting the reverse orientation flag (cf. #1306)

new optional parameter in model::isInside to choose if the check is performed using parametric coordinates (the default) or model coordinates

- new fltk/openTreeItem and fltk/closeTreeItem api functions to manipulate the menu through the api

in addition to the default camelCase function names, add snake case aliases in the Python and Julia API, as this is the recommended style in these languages

get{Edge,Face}Number -> get{Edge,Face}Tags for consistency + remove experimental warning, as this is here to stay

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

new (probably temporary) gmsh/mesh/createEdges and gmsh/mesh/createFaces (until we provide a facility to simply create and store mesh edges/faces as elements)