relax SVN archive

Fix for the pipe editor window - it is now updated when initially created to show all loaded pipes.

Fixes for all the calls to the GUI interpreter instance.

This is now a special thread object, and user function calls are now queued.

The auto-analysis GUI pages are now waiting for the data pipe to be created.

This fixes race conditions.

The GUI interpreter thread is now flushed prior to execution of the auto-analyses.

Created the GUI interpreter thread flush() method for blocking until the queue is empty.

Maybe found a way to switch from one equation to the other.

This approach, not general, uses the number of parameters as a
test to the use of either the 2-parameter equation 'exp_2param_neg' or
the 3-parameter equation 'exp_3param_inv_neg'...

It is not clear if it works, but, at least, the code compiles...

Made the code for disassembling the parameter vector more general.

Before, there was an explicit statement of the "inv" equation.
Now, the code is more general and "inv" became "exp_3param_inv_neg",
one of the many 3-parameter equations...

Changed fitted values of the first spin from values to None.

This is because this spin is in the list of deselected spins.

Added a join() wrapper method for the GUI interpreter thread internal queue.

Added the empty() method to the GUI interpreter thread to determine if the internal queue is empty.