relax SVN archive

Reverted revisions r17702, r17701, r17693, r17687, r17685, r17684, and r17669.

The command used were:
svn merge -r17702:17669 relax_io.py
svn merge -r17702:r17701 /data/relax/relax-trunk/generic_fns/structure/internal.py

The relax_io module should now handle all files as text, independent of compression. These reverted
revisions were attempts at fixing the buggy behaviour of Python 3.0, 3.1 and 3.2. But now the
io.TextIOWrapper() class is being used to eliminate the byte streams, which should be text streams.

The relax_io.open_read_file() now supports all Python versions over 2.4.

This required some really nasty hacks for Python 3.0, 3.1 and 3.2 with the Bzip2Fixed and GzipFixed
classes overriding the incomplete and buggy bz2.BZ2File and gzip.GzipFile modules, and being wrapped
around io.TextIOWrapper().

Added the IO module to the relax information print out and dependency checks.

The manual C module compilation script is now executable.

Renamed the 'scripts' directory to 'devel_scripts' so that users are less likely to ask about the scripts.

Finished off the C module compilation testing script.

Added a script for testing out the C module compilation on multiple python targets.

The relax_fit specific analysis module now supports both Python 2 and 3.

The command used was:
2to3 -w specific_fns/relax_fit.py

The relaxation curve-fitting C module now supports compilation on both Python 2 and 3.

First attempt at making the relaxation curve-fitting C module Python 3 compatible.