Python: Add setup file to create sdist package for PyPI

The new setup_pypi.py file can be used to generate the sdist package
for the XRootD python bindings. This should be used only wen creating
the package for distribution in PyPI.

bindings/python/MANIFEST.in

@@ -0,0 +1,7 @@
+include README.rst
+include VERSION_INFO
+include genversion.sh
+recursive-include tests *
+recursive-include examples *.py
+recursive-include docs *
+recursive-include src *

bindings/python/setup_pypi.py

@@ -0,0 +1,58 @@
+from distutils.core import setup, Extension
+from distutils import sysconfig
+from os import getenv, walk, path, path, getcwd, chdir
+import subprocess
+
+# Remove the "-Wstrict-prototypes" compiler option, which isn't valid for C++.
+cfg_vars = sysconfig.get_config_vars()
+opt = cfg_vars["OPT"]
+cfg_vars["OPT"] = " ".join( flag for flag in opt.split() if flag != '-Wstrict-prototypes' )
+
+
+sources = list()
+depends = list()
+
+for dirname, dirnames, filenames in walk('src'):
+  for filename in filenames:
+    if filename.endswith('.cc'):
+      sources.append(path.join(dirname, filename))
+    elif filename.endswith('.hh'):
+      depends.append(path.join(dirname, filename))
+
+xrdlibdir = getenv( 'XRD_LIBDIR' ) or '/usr/lib'
+xrdincdir = getenv( 'XRD_INCDIR' ) or '/usr/include/xrootd'
+
+# Get package version
+topdir = path.dirname(path.dirname(getcwd()))
+p = subprocess.Popen(['./genversion.sh', '--print-only'], stdout=subprocess.PIPE, cwd=topdir)
+version, err = p.communicate()
+version = version.strip()
+
+print 'XRootD library dir: ', xrdlibdir
+print 'XRootD include dir: ', xrdincdir
+print 'Version:            ', version
+
+setup( name             = 'pyxrootd',
+       version          = version,
+       author           = 'XRootD Developers',
+       author_email     = 'xrootd-dev@slac.stanford.edu',
+       url              = 'http://xrootd.org',
+       license          = 'LGPLv3+',
+       description      = "XRootD Python bindings",
+       long_description = "XRootD Python bindings",
+       packages         = ['pyxrootd', 'XRootD', 'XRootD.client'],
+       package_dir      = {'pyxrootd'     : 'src',
+                           'XRootD'       : 'libs',
+                           'XRootD.client': 'libs/client'},
+       ext_modules      = [
+           Extension(
+               'pyxrootd.client',
+               sources   = sources,
+               depends   = depends,
+               libraries = ['XrdCl', 'XrdUtils', 'dl'],
+               extra_compile_args = ['-g'],
+               include_dirs = [xrdincdir],
+               library_dirs = [xrdlibdir]
+               )
+           ]
+       )