Bug fix
Changed NID_MN, NID_OPERATIONAL and NID_RADIO to a string instead of a number
Bug fix #278
Rollback because it does not work for higher order functions
Bug fix #351
Just for you, Svetlana !
Bug fix #351 : The visitor was not working as I expected it was...
Bug fix #322
Bug fix #380
Bug fix #380 : Removed the check for variable since it is redundant with an existing check
Merge branch 'Upstream/master'