relax SVN archive

Rounding error fix for the test_format_table4() unit test of lib.text.table.format_table().

Implemented the custom_format argument for lib.text.table.format_table().

This allows cell contents to be formatted as the user asks. It defaults to standard string
conversion is the custom conversion fails.

Modified the test_format_table4() unit test of lib.text.table.format_table().

This change is to test the currently unimplemented custom_format argument. This will be used to
allow special formatting in the table. For example using '%.3f' for a float.

Numbers are now right justified in cells in the lib.text.table.format_table() function.

Converted the test_format_table4() unit test of lib.text.table.format_table() to check justification.

The right justification of cells with numbers will be implemented to match these changes.

The table contents are now all converted to strings in lib.text.table.format_table().

This uses the _convert_to_string() private function.

Created a new unit test of lib.text.table.format_table() to check for non-string type data.

Slight changes to one of the lib.text.table.format_table() unit tests.

Fix for calculating column widths when multi-column cells are present in lib.text.table.format_table().

Spacing between heading rows is now functional in lib.text.table.format_table().