From Philippe: This patch adds an error message if the user tries to create a formula name the reserved names x,y,z or t. It also prevents this function to be added to the list of functions (because it would lead to an infinite recursion when any other function is created).
From Philippe:
This patch adds an error message if the user tries to create a formula name
the reserved names x,y,z or t.
It also prevents this function to be added to the list of functions
(because it would lead to an infinite recursion when any other function
is created).


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@11149 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root