support for reading gzipped detailed logfiles

in all cases; provide a version that is not magical if we are not in Zope.
Tested with Python 2.1.1 and 2.2.1 (CVS).

        unicode support for the GlobbingLexicon

module.  My *hope* is that this takes care of the single deprecation warning
produced when running the regression tests on the trunk with Python 2.2.

Shane, I'm going to beg you to help me get my test setup cleaned up
tomorrow!

original checkin message:

    DateTime.__init__() and DateTime.__str__():  When a fractional
    number of seconds is passed in or derived, round it to the
    nearest millisecond.  Also changed str() to produce no more than
    three digits after the second's decimal point (if any).

    This ensures that DateTime->string->DateTime loses no information.
    Before this change, platform rounding errors in float<->string
    conversion could lose information in both conversion steps, so a
    DateTime object converted to string and back again didn't always
    reproduce the input object's value.  That's bad on its own, and
    testDateTime.py's testConstructor3() failed about 1% of the time
    on Linux as a result.  It doesn't fail after this patch.

    CAUTION:  Note that DateTime objects have at finest millisecond
    resolution now, even if the platform time.time() happens to have
    resolution finer than that.

Note that he also had to fiddle with the function that returned system
time, so he's got a wrapper around time.time() that rounds to 3 places
the float returned by system time.   All the testing I've done
indicates that this intermittent fixes the comparison failures.

as text to be represented as underline.

- updated tests and HTML references

Python 2.2.

changed --today option to use localtime() instead of gmtime()
(BigM logs are written using localtime())

module version number from a CVS substitution. This actually
caused core dumps running the unit tests on OS X.

Also changed the unit test to no longer just skip the test for the
ISO splitter on OS X.

changed character set to UTF-8 to present unicode strings in a proper way

in DTML. This is a workaround because usually conversions should work
*without* importing the codecs module explictly

      - Collector #227: improved handling of unicode string in TextIndex.py
        with unmodified default encoding in site.py.

(Collector #221)

        replaced by underscores to avoid confusion with some FTP clients.

Use difflib instead of ndiff (http://collector.zope.org/Zope/32)

        because the downloaded file has been stored with a HTTP
        header at the beginning of the file. Fixed!