relax SVN archive

Added a text file documenting the changes in preparation for Python 3.x.

The execfile statement has been replaced with a call to the exec(compile()) function.

This was done with the python 2.x to 3.x script with the commands:
2to3 -w -f exec relax .

The change is in preparation for Python 3.0, and relax still works with Python versions 2.4, 2.5,
and 2.6. The syntax has changed from:

execfile(script_file, local)

to:

exec(compile(open(script_file).read(), script_file, 'exec'), local)

Hmmm, not much of a language simplification!

The exec statement has been replaced with a call to the exec() function.

This was done with the python 2.x to 3.x script with the commands:
2to3 -w -f exec relax .

The change is in preparation for Python 3.0, and relax still works with Python versions 2.4, 2.5,
and 2.6.

The dictionary keys() return value is now converted into a list.

This was done with the python 2.x to 3.x script with the commands:
2to3 -w -f dict relax .

The change is in preparation for Python 3.0, and relax still works with Python versions 2.4, 2.5,
and 2.6.

Renamed the pipe.list() user function to pipe.display().

Modified the behaviour of raise statements according to http://www.python.org/dev/peps/pep-3109/.

This was done with the python 2.x to 3.x script with the commands:
2to3 -w -f raise relax .

The change is in preparation for Python 3.0, and relax still works with Python versions 2.4, 2.5,
and 2.6.

Converted all print statements into print() function calls.

This was down with the python 2.x to 3.x script with the commands:
2to3 -w -f print relax .

The change is in preparation for Python 3.0, and relax still works with Python versions 2.4, 2.5,
and 2.6.

Removed all usages of the has_attr() dictionary method.

This was down with the python 2.x to 3.x script with the commands:
2to3 -f has_key relax . -w

The change is in preparation for Python 3.0, and relax still works with Python versions 2.4, 2.5,
and 2.6.

Bug fix for the relaxation curve-fitting difference plot script.

The spin_loop blocks were missing colons!

Replaced all instances of `x` with repr(x).

This was down with the python 2.x to 3.x script with the commands:
2to3 -f repr . -w
2to3 -f repr relax -w

The change is in preparation for Python 3.0, and relax still works with Python versions 2.4, 2.5,
and 2.6.