
Exp::settablecolumns bug:
    all entries must have spaces before the comma.

	tool1.var,tool2.var  --> will not work
	tool1.var, tool2.var -- will

Exp::load:
    the following didn't work right (variable overriding bug):
	
	tool.$GFILE = file
	tool.var = newval

    if $GFILE already contains variable ``var'' and if it comes first in
    the hash table, the next call to ToolInstance::addvar didn't override
    it.
    
FIX: changed the ti->addvar in Exp::load to ti->setvarval.
