relax SVN archive

Removed the completely unused gui.components.conversion module.

Removed an unused import (which was breaking relax in Python 3).

Python 3 preparations - all os.popen3() instances in relax have been replaced by the subprocess module.

Python 3 preparations - eliminated the use of the os.popen3 function from the info module.

More exception handling changes to be Python 2.4+ compatible.

Python 3 preparations - exception handling fix to be Python 2.4+ compatible.

Reverted r17598 for the multi.processor module as this breaks in Python 2.

The command used was:
svn merge -r17598:r17597 processor.py

Python 3 conversions using 2to3.

The command used was:
2to3 -w \
-f buffer \
-f idioms \
-f set_literal \
-f ws_comma \
-x except \
-x import \
-x imports \
-x long \
-x numliterals \
-x xrange \
.

Updated the Python 2 to 3 checklist document for the shifting of the 'relax' file to 'relax.py'.

Python 3 preparations - removed all usage of the xrange() in the generic_fns package as none are needed.

The command used was:
2to3 -w -f xrange .