Back in June in revision 1.98 Steve (accidentally, presumably) wiped

Back in June in revision 1.98 Steve (accidentally, presumably) wiped
out a month's worth of checkins to libstdtypes.tex (including my
extended slice docs).

I think this checkin merges them all back in, but if you make one of
these checkins:

    revision 1.97
    date: 2002/06/14 00:27:13;  author: nnorwitz
    Use \code{True} (or False) instead of true/false.
    Not sure if code is correct, but that is what's in this file.
    I've seen \constant{True} in other places.
    ----------------------------
    revision 1.95
    date: 2002/05/22 20:39:43;  author: bwarsaw
    Jack's documentation for the U mode character on the file()
    constructor, vetted by Barry.
    ----------------------------
    revision 1.94
    date: 2002/05/21 18:19:15;  author: rhettinger
    Patch 543387.  Document deprecation of complex %, //,and divmod().
    ----------------------------
    revision 1.93
    date: 2002/05/15 15:45:25;  author: rhettinger
    Added missing index entries for mapping methods.  Closes patch
    #548693.

some checking may be in order.