relax SVN archive

The installation chapter has been partially rewritten with the title changed, sections on the Linux
precompiled distribution, source distribution, and running a non-compiled version added, and Dasha
and Modelfree4 added to the list of optional programs. Indexing has been added to the chapter.

In the data analysis chapter, more indexing has been added.

In the makefile, the rules 'install' and 'uninstall' have been added. When 'make install' is typed,
the dir /usr/local/relax is made, all files are copied there, a symlink called /usr/local/bin/relax
is made to /usr/local/relax/relax, and the program is run with the test flag to generate the
byte-compiled *.pyc files. 'make uninstall' will delete the symlink /usr/local/bin/relax and the
directory /usr/local/relax.

I've started debugging the docstring extraction and formatting script docs/latex/fetch_docstrings.
The bug is only partially fixed.