Make the API documentation easier to find

[mpotse]

Until now users had to navigate to libmmgX.h in the doxygen documentation to find the API documentation, without any guidance. Only by looking at the examples one could guess that the documentation is there.
To make this easier I defined a Doxygen group for the API docs and added configuration to make this group appear as a fifth tab on the html pages. The page under this tab lists the three files and provides a logical place for a common introduction into the three APIs.

Question: For this proposal I put the group definition in libmmg3d.h. Would there be a more appropriate place, for example a dedicted header file under src/common or something in the root of the tree?

[Algiane]

Hi,

Thanks for the proposition of adding an API tab on the documentation.

Regarding the location of definition of the Doxygen group for the API, do you think that it can be in the src/mmg/libmmg.h header file ? This header allows to directly include the headers needed for the 3 libraries.

Otherwise, the src/common/libmmgtypes.h header may be a suitable location too.

Thanks by advance,

[Algiane]

Thanks!