relax SVN archive

The lib.check_types now imports io.IOBase from the lib.compat module.

This is to shift more Python 2 vs. 3 compatibility into lib.compat and out of all other modules.

Unicode fixes for the "\u" string in "\usepackage" in the module docstring.

This requires escaping as "\\usepackage" to avoid the unicode character '\u'.

Better Python 3 compatibility in some test suite shared data profiling scripts.

These changes invert the logic, importing the Python 3 builtins module and aliasing xrange() to
range(), and passing if an ImporError occurs. The code will now no longer be modified by the 2to3
program.

The lib.errors module is now importing lib.compat.pickle for better Python 2 and 3 support.

This shifts the compatibility code from lib.errors into lib.compat so that the 2to3 program will not
touch the lib.errors module.

Python 3 fixes via 2to3 - the execfile() function does not exist in Python 3.

The command used was:
2to3 -j 4 -w -f execfile .

Python 3 fixes via 2to3 - proper handling of the dict.items() and dict.values() functions.

These are now all wrapped in list() function calls to ensure that the Python 3 iterators are
converted to list objects before they are accessed.

The command used was:
2to3 -j 4 -w -f dict .

Small update to the 2to3_checklist document - the print statement conversion has been added.

Python 3 fixes via 2to3 - elimination of all apply() calls.

This only affects the GUI which cannot run in Python 3 yet as wxPython is not Python 3 compatible
yet.

The command used was:
2to3 -j 4 -w -f apply .

Manual Python 3 fixes for the dict.key() function which returns a list or iterator in Python 2 or 3.

This involves a number of changes. The biggest is the conversion of the "x in y.keys()" statements
to "x in y". For code which requires a list of keys, the function calls "list(y.keys())" or
preferably "sorted(y.keys())" are used throughout (sorted() ensures that the list will be of the
same order on all operating systems and Python implementations). A number of "x in list(y.keys())"
statements were simplified to "x in y", some list() calls changed to sorted(), and some unnecessary
list() calls were removed.

Expanded the Python 2 to 3 conversion document.