Don't need 2to3 callable fixer.

Only Python 3.0 and 3.1 are missing the callable(x)
function, it returned in Python 3.2. This means we
don't need to apply this fixer.
Clearer error from Bio.Wise when missing argument
Python3 style map function works here (iterator not list)
Use list comprehension instead of map

This avoids triggering any changes via 2to3.
No longer need 2to3 map fixer