Remove references to string based exceptions in the doc.

("section").

are interpreted.
This closes SF bug #532467.

dropped in the HTML formatted version.
Reported by Mike Coleman.

the manual refer to it.

XXX Not sure that it belongs in this section, or that the concept is
particularly important for writing documentation.  Perhaps references
to the frame should be removed entirely.

Replace section 4.1 with section A.3.

The new section 4.1 is titled "Naming and binding."  It includes the
text of section A.3 augmented with some of the detailed text from the
old section 4.1.

The \dfn, \index stuff is probably wrong, but I tried.

Also update other parts of appendix A to mention that nested scopes
and generators are standard features.

docs were introduced.  This loses a few small changes, but Fred says
that's okay.

Move some index entries next to what they are referring to for better
"targetting".

When refering to chapters, use \ref, don't hardcode the chapter
number.

the latest latex2html beta.

semantic file names in the HTML.  No more node#.html files!

lib.tex: add libimp; remove bogus warning about lineii.
libmath.tex: document hypot().
libmd5.tex: rename md5.md5() to md5.new().
libposix.tex: document chown().
libposixfile.tex: openfile() instead of fileopen().
libsocket.tex: document gethostbyaddr().
libtypes.tex: add footnote explaining why readline() keeps the newline.
ref3.tex: correct typos, add back*quotes to index.
ref4.tex: don't use \verb inside footnote.
ref5.tex: explain repr() and str() and add them + back*quotes to index.
ref6.tex: correct typo, don't use \verb in footnote.
ref7.tex: don't use \verb in footnote.

* lib1.tex (section{Built-in Functions}): added bagof(), lambda(), map()
  and reduce().  Repharased apply().  Removed or rephrased references to
  exec() (now the exec stmt).
* lib4.tex: posix.exec --> posix.execv
* ref4.tex, ref8.tex, tut.tex: builtin --> __builtin__
* lib3.tex (module string): added atof() and atol(), and ato[fl]_error.