fixed a bug in scalarformatter's get_offset
Modify logic to test if shapelib installed.
Masked array support for pcolormesh; edited docstrings.
temporary fix to make sure shapelib and dbflib are actually built
moved pyshapelib/lib/* to lib/ so setuptools' develop command works properly
Reorganized axes.py, moved most of the table method into table.py
fixed a bug related to usetex, sans-serif fonts, and exponential ticklabels
adding some fixes so the VS6 compiler doesn't complain
minor superscript text layout fix
called renderer base init in backend ps and agg
