relax SVN archive

Created a new module for simultaneous Python 2 and 3 support in relax called 'compat'.

Python 3 fixes - the list() function is now used in combination with range() to generate the ordered list.

range() in Python 3 is an iterator object (just as xrange was), so now the list() function has to be
called.

Python 3 preparations - mass conversion of all xrange() calls to range().

Fix for a bug introduced at r17624 in the generic_fns.sequence.validate_sequence() function.

The is_none() function call doesn't seem to be working correctly.

Created the special check_types.is_filetype() function for checking for files in all Python versions.

Python 3 - Eliminated an unneeded xrange call.

Python 3 - eliminated the use of the map() function, as this behaves differently in Python 3.

Python 3 - removed the use of the string.lower() function as it is missing in Python 3.

Python 3 fix for the relax information print out.

The try blocks seem to now operate slightly differently in Python 3.

Python 2 fixes - the Python 3 fixes for the ScientificPython module imports broke Python 2.