dbfpy

we've got a dbf where numeric fields are padded with <NUL> characters. on
these the library crashes:

File "/usr/local/lib/python2.6/dist-packages/dbfpy/fields.py", line 240,
in decodeValue
# a float (has decimal separator)
ValueError: null byte in argument for float()

I would add this line just after stripping the value, before converting it
to float/integer:
value = value.replace('\0', '')