sphinx will fail in a race condition, if every sphinx target
uses the same CACHE dir:
Exception occurred:
File "/usr/lib/pymodules/python2.7/sphinx/cmdline.py", line 189, in main
app.build(force_all, filenames)
File "/usr/lib/pymodules/python2.7/sphinx/application.py", line 204, in build
self.builder.build_update()
File "/usr/lib/pymodules/python2.7/sphinx/builders/__init__.py", line 196, in build_update
'out of date' % len(to_build))
File "/usr/lib/pymodules/python2.7/sphinx/builders/__init__.py", line 238, in build
self.env.topickle(path.join(self.doctreedir, ENV_PICKLE_FILENAME))
File "/usr/lib/pymodules/python2.7/sphinx/environment.py", line 351, in topickle
movefile(filename + '.tmp', filename)
File "/usr/lib/pymodules/python2.7/sphinx/util/osutil.py", line 104, in movefile
os.rename(source, dest)
OSError: [Errno 2] No such file or directory
* split usage to three files: usage, conffile, options
* fixing minor typos in mirall.1.rst and owncloud1.rst
* owncloud.1 uses include conffile, options
* mirall.1 uses include conffile, options
* Fixes: #183
hefee