nuweb for Literate Programming Subversion code

Update version.

* nuweb/htdocs/index.html: updated for this release & new SF URLs.
* nuweb/nuweb.w: updated version.

Update for version 1.59.

* nuweb/Makefile (VERSION): updated to 1.59.
(clean): remove *.pdf.
(veryclean): likewise.
* nuweb/README: included brief note on 1.59.
* nuweb/nuweb.w: eliminated compiler warnings from gcc and clang.

This time, removed the CVSROOT directory as well.

Tagged release 1.58 (rather after the fact!)

This is the first commit after the SF-forced move to something other
than CVS (here, SVN) so removed the CVSROOT folder too.

Update to 1.58

This commit was manufactured by cvs2svn to create tag 'Release_1_57'.

Preparation for release 1.57.

Fixed SF3416213, \it deprecated in LaTeX2e, use \itshape.

Fixed SF3416213, \it deprecated in LaTeX2e, use \itshape.
At the moment nuweb outputs <indent> blanks before any line,
even it it's empty, so ignore space change in the C output file.

Fixed SF3416213, \it deprecated in LaTeX2e, use \itshape
Fixed SF3431294, Fragment page number refs don't work in memoir class
Fixed SF3432035, -d output file flag doesn't work
Removed use of hyperref parameter dvipdfm (-> error in TeX Live 2011)
Tidied source_ungetc()