BugID: 664

A couple of minor changes are made to meet the requirement of OTB:
 - The OTDBtree info structure was extended with an description field and a
   function for setting this description was added.
 - The momID of the OTDBtree structure is now private.
 - A function setSchedule was added to set the scheduling time of a VH tree.
 - The function saveComponentParam was reamed to saveParam because it is also
   used for saving VT and VH parameters.
 - The test programs are updated to include the new functions.