Fixed RaiseException(..)

`RaiseException(Ex: TIFException; Param: string);` was rasing the
"error" in the delayed code.

Works fine now.
Added integer-"Sqr" function

Lape was missing `Sqr(i:Int64): Int64` so I added it.
Overloaded the second Sqr method

Ruined a perfectly good commit count =P