[Kst] Equation parser decisions to make

[Nicolas.Brisset at eurocopter.com]

George,

one other thing I noticed incidentally while using equations is that vector 
names with the symbol '%' in them cause problems. It would be reasonable to 
expect that this symbol is not parsed when enclosed in square brackets like 
in [Vector1_%] where it may indicate a unit for example. Of course, the 
modulo operator '%' should be parsed elsewhere.

Nicolas