[MartinZ]

Hi developers,

1) I added / unified groups and subgroups and added comments (most of them like commented in yann's 14.1 documentation)

2) I changed doxfile so we get a treeview left side screen in doxygen - generated documentation

3) I used grouping scheme:

 //! \defgroup Groupname Description 
  //! \{

  //! \}

or

 //! \addtogroup Groupname  
  //! \{

  //! \}

for the main groups like "Graphics"

and

 //! \defgroup Groupname Description 
  //! @{

  //! @}

or

 //! \addtogroup Groupname 
  //! @{

  //! @}

"@" and "\" do the same - but this way you can see directly that "@" includes subgroups.

and I used

//! \name Description
//! @{


//! @}

for additional structuring.