template parser ignores operators' priorities

[eel ghEEz]

I had to put braces into a logical expression to obtain correct results.

The original statement without braces,

  $if not x and y:

evaluated as if "not" was applied to the rest,

  $if not (x and y):

[eel ghEEz (ilatypov)]

(using Ubuntu webpy 0.210-1).

[Anand Chitipothu (anandology)]

This doesn't happen with the new implementaion of templator.