Change debug messages in modules from print to stderr to log using the
logging module.  See the section 'Debugging and Logging' in
pan.wfapi.rst and pan.xapi.rst for an example of configuring the
logging module to enable debug output.

IMPORTANT NOTE: the debug argument has been removed from the
constructors, so programs using them must be modified.
remove undocumented xml_python() method from pan.xapi and pan.wfapi.
Use pan.config if you need this.
PEP8
bug in panconf.py: positional arguments not initialized to none in
conf_set()
add platform ID for Windows 7 64-bit sandbox.
0.5.0
-current
Don't name the internal log function log as this steps on the log()
method in pan.xapi; change in all modules for consistency.