Whitespace issues

[mschoeb]

Our parser does not concern itself with where whitespace is allowed or not allowed at the moment. If it is parsable, it parses it. But this gives some issues such as:

• 4 + / * 5 should be a parser error but works fine ([op/numeric-multiply.xml] K-NumericMultiply-27)

• 10div 3 should also be a parser error but works fine ([op/numeric-mod.xml] K-NumericMod-22)

To fix these we probably need to consider more of the rules specified here