[FEATURE] New API's are made available to GUI.

 - New API's: SetIndexAttribute SetSubIndexAttribute
 - Fix: While setting the ForceToCDC flag the OBJECT type resets in the index
 - Adapt support for the new API's in the TCL/Tk and CSharp wrapper.
 - minor documentation fixes.

Signed-off-by: Ramakrishnan P <ramakrishanan_p@kalycito.com>