Currently, contains one function: compile_command(), which helps
determining whether a source string is complete, incomplete or in
error.  This is useful when writing your own version of the Python
read-eval-print loop.

Noted this in the XXX comments.
Also, changed all three functions to use the attributes if they exist.

Also corrected a typo in format_stack (t should've been f).

removed some of his own cruft.  Added \g<...> references in replacement text.

int+int, int-int, int <compareop> int, and list[int].
(Unfortunately, int*int is way too much code to inline.)

Also corrected a NULL that should have been a zero.

the cache code.

"make lib tut ext" should now be errorfree.

at some places.

	* \bcode, \ecode added everywhere
	* \label{module-foo} added everywhere
	* A few \seealso sections added.
	* Indentation fixed inside verbatim in lib*tex files

AMK's sed job.