Adds a check to logic/valididate.py that checks the partial path format using a regexp. This regexp has been added to logic/path_link_name.py, therefore changing PATH_LINKNAME_REGEX to use the PARTIAL_PATH in building this regexp. Plus views/models/docs.py now uses the validation functions in the clean_ methods. Patch by: Lennard de Rijk Review by: Pawel Solyga

"""
Code used in a couple of places to work with the current thread's environment.
Current users include i18n and request prefix handling.
"""

try:
    import threading
    currentThread = threading.currentThread
except ImportError:
    def currentThread():
        return "no threading"