pyshapelib tests

[Bram de Greve]

Bram de Greve wrote:
> However, the test still crashes a bit later ... dbflib_read_record is 
> called with args = NULL.  I've haven't been able to track down the cause 
> of this problem yet.
>   
I've solved this as well.  As it turned out, the commit() function was 
pointing to dbflib_read_record.  d'oh! =)
test_dbf_table.py runs without errors now.

Bram