relax SVN archive

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.

Added a switch in the C code for curve fitting.

The switch will allow the use of specific equations depending on
the model chosen.

However, it is still not functional... :(

Added tests values for the fitting of data from the second spin.

This second spin was added in revision 14451.

Added "sigma_I" and "var_I" values.

The values were the ones output from relax (assuming it is right.)