1. In VS.py replaced the local variable slice with is_slice in the
   function __buildStartCount.  The built-in function slice is used in
   the function isinstance in this function.  Without the rename, at
   least for version 2.7, Python will throw an error claiming that
   a local variable, slice is being used in isinstance.  This will
   cause examples inventory_1-2.py, inventory_1-3.py, and
   inventory_1-5.py to fail.

2. Increased the character buffer size for the VData field names from 256
    to 4096 bytes in the SWIG interface file hdfext.i.  This allows Pyhdf
    to read VData records with a larger number of fields and long field
    names without crashing.  Also defined the constant CHAR_BUFFER_SIZE
    and used in all places where the DVata field name buffer needed to be
    specified.  Also defined a similar constant for the attribute name
    buffer.  (In this case the buffer has a maximum size of 128 specified
    by the underlying HDF 4 library.)

3. Although they are derived from hdfext.i,the new versions of hdfext.py
    and hdfext_wrap.c have been checked in.  At least on a MacMini running
    OS 10.8.5 and with Python 2.7 and GCC 4.2.1, setup.py does not
    automatically generate these files using SWIG.  They had to be manually
    generated using the command

        swig -python hdfext.i

    inside of the python-hdf4/hdfpy/ directory.
Merge pull request #2 from bmagill1250/master

increase some buffer sizes and don't use 'slice' as variable