relax SVN archive

The relax GUI is now robust and able to withstand a call to the reset user function.

This could have occurred if the user ran a script with a reset() call, or if reset() was typed at
the GUI version of the relax prompt.

The ANSI ending escape sequence is now always placed before the last newline.

This fixes some weirdness of the cursor or other parts being coloured when they should not be.

The script ANSI colour is now cyan to fit better into the relax blue/black colour theme.

Fix for the GUI interpreter when turning off the ANSI codes of the relax prompt.

Better control of the relax prompt colouring via ANSI escape sequences.

The new Exec_info.prompt_colour_on() and Exec_info.prompt_colour_off() methods are now used to turn
the colours on and off by aliasing the coloured or non-colours prompts to both the class instance
namespace and to the sys module.

Shifted the script colouring ANSI escape sequences into the 'ansi' module.

Fix for a typo in r15769.

Shifted the terminal colouring ANSI escape sequences into their own 'ansi' module.

This will allow the colours to be easily changed.

The test suite is now only imported in the test modes of operation.

This should also speed up program initialisation.

The import of the gui package now only occurs in GUI mode.

This will speed up the program start up. It also has the side effect of bypassing the hack of the
GUI resetting the ANSI escape characters of the relax prompt.