doc: use "sourcecode" directive instead of "code" + small mistakes fixes: RST "code" directive is not always working well with "jinja" code. It has been replaced with sphinx specific "sourcecode" (alias of "code-block", nicer to read in not formatted doc) which is working better.

import os.path

version_file = os.path.join(os.path.dirname(__file__), "VERSION")
try:
    with open(version_file) as f:
        __version__ = f.read().strip()
except NotImplementedError:
    # pyjamas workaround
    __version__ = "0.7.0D"