WEDM does not allow space in CALC expression

[slominskir]

According to the docs an inline CALC expression in EDM is defined like:

CALC\{A+B}(pv1, pv2)

However, EDM actually is fairly forgiving and will work even with a space between the expression and variable list like so:

CALC\{A+B} (pv1, pv2)

WEDM is currently not so forgiving and will mark the CALC item as invalid. It would be nice if WEDM matched EDM more closely.