"explicit" OCC_Internals API can now also be used in "implicit" mode (assigning and returning an automatic tag)

Added: members of structures being lists of strings and functions to get their elements or the full lists; also added: function to get full lists of strings (was not available)

Struct: list of reals added for members, with access to their elements; other changes related to Struct

Reorganization of FloatParameterOptions and CharParameterOptions (possibly without comma at the beginning); Struct is now without value

remove OrientedBoundary and Unique2: Boundary now always returns the signed (oriented) boundary: this is what we used to do in 
the old Geo. To get valid entity numbers, just use Abs()

* modified new internal CAD APIs to always preserve the order of the entities in transformations (even across dimensions)
* refactored extrusions - the refactoring of the old Geo code is complete (the parser does not include Geo.h anymore!)
* fixed incoherence when deleting internal entities during boolean operations, after synchronzing them with GModel
* made sure we don't bind OCC entities to multiple tags