Add controls for some of the esoteric indexing macros.

In the __coerce__ description, None should be returned if the
conversion is *impossible*, not *possible*.  Reported by Robert Kern
<kernr@ncifcrf.gov>.

	want to push nodes into the document, but into a document
	fragment, since we're not necesarily working with something
	that's well-formed.

least there's a token object in here now!  ;-)

(M.-A. Lemburg and GvR).

This still doesn't understand anything about multiple source files or
checking time dependencies.

updates by Tim Peters, markup by FLD.

1. Fixes float divmod so that the quotient it returns is always an integral
value.

2. Fixes float % and float divmod so that the remainder always gets the
right sign (the current code uses a "are the signs different?" test that
doesn't work half the time <wink> when the product of the divisor and the
remainder underflows to 0).

(The difference between grid_remove() and grid_forget() is that the
former remembers the options for the slave.)

(I tweaked it slightly so examples are allowed to have no date too.)

(Andrew Dalke & kjpylint)

Make error an alias for ValueError.
(Andrew Dalke & kjpylint)

This will enlighten Andrew Dalke; I don't know about kjpylint. :-)

undefined 'nframes'.  Should be self._nframes.  (Andrew Dalke & kjpylint)

I'm still unsure, but couldn't stand the virtual event trickery so tried a
different sin (adding undo_block_start/stop methods to the Text instance in
EditorWindow.py).  Like it or not, it's efficient and works <wink>.  Better
idea?

Give the attached a whirl.  Even if you hate the implementation, I think
you'll like the results.  Think I caught all the "block edit" cmds,
including Format Paragraph, plus subtler ones involving smart indents and
backspacing.

[W]hile trying to dope out how redirection works, stumbled into two
possible glitches.  In the first, it doesn't appear to make sense to try to
rename a command that's already been destroyed; in the second, the name
"previous" doesn't really bring to mind "ignore the previous value" <wink>.

and foo/index.html.  Make a copy instead.  (Appearantly some tar
openers on non-Unixlike systems can't handle hard links.)

and $part/index.html.  Make a copy instead.  (Appearantly some tar
openers on non-Unixlike systems can't handle hard links.)

meaningful return values: respectively, whether the copy was done, and
the list of files that were copied.  This meant some trivial changes in
core.py as well: the Command methods that mirror 'copy_file()' and
'copy_tree()' have to pass on their return values.

of the 'install_py' command rather than 'build_py'.  Obviously, this
meant that the 'build_py' and 'install_py' modules had to change; less
obviously, so did 'install' and 'build', since these higher-level
commands must make options available to control the lower-level
commands, and some compilation-related options had to migrate with the
code.

once for foo + module.so, once for foomodule + .so).

there, but the "modules" icon is active.