relax SVN archive

Fix for the Relax_fit.test_bug_12670_12679() system test for the changes to Grace files at r17716.

Python 3 fix for the relax_io.open_write_file() function.

This now matches the behaviour of open_read_file() in that there are three different behaviours for
opening bz2 and gz files for writing to for the different Python versions (one for Python 2, one for
Python 3.0 to 3.2, and one for Python 3.3+). All byte streams have been eliminated as
open_write_file() is for creating text files.

Python 3 fix for the Noe.test_noe_analysis() system test for the grace.write precision changes.

For consistency between Python 2 and 3, the grace.write user function outputs to 15 decimal places.

This increased precision will only be of use in the relax test suite.

Python 3 fix for the Pipes.test_pipe_bundle() system test.

The order of bundle names returned by generic_fns.pipes.bundle_names() is not guaranteed in Python 3.

Reverted r17681 as file objects in relax are now always treated as text, so byte streams are not needed.

The command used was:
svn merge -r17681:r17680 .

The C module compilation testing script now accepts the Python version as a first argument.

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.