No support for parenthetical multiplication

[hawkw]

Attempting to calculate expressions with a factor in front of a parenthetical expression (such as 2(5*10)) raises an error saying Error: 'int' object is not callable. I assume this is because this is parsed as a function application.

Of course, I can always just type 2 * (5*10), so this is pretty low-priority. But it'd be cool.