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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().

Implemented multi-column support in lib.text.table.format_table().

Created a unit test for the lib.text.table.format_table() function to test multiple column support.

Support for content spanning multiple cells is yet to be implemented.