relax SVN archive

Bug fix for the GUI when deleting analysis tabs.

The deletion of analysis tabs was previously failing in certain cases. The problem was the
generic_fns.pipes.delete() call in the middle of the delete_analysis() method causing a notification
to be sent to the pipe_deletion GUI observer object, which would then handle the pipe deletion prior
to the completion of the delete_analysis() call causing things to get out of sync.

Fix for a bug triggered by wxPython 2.9 when deleting the last analysis tab.

The self.notebook object is now deleted when the set_init_state() method is called, allowing it to
be properly accessed and recreated.

Converted the pipe switching with GUI tab switching to synchronous to avoid rare races.

This racing is triggered by wxPython 2.9. This change should not affect wxPython 2.8 installs.

The analysis deletion buttons now do nothing if the notebook is not created yet.

This avoids problems on the new wxPython 2.9 versions.

Missing import.

Increased the size of the model-free model change warning dialog for wxPython 2.9 on GNU/Linux.

The file selection wizard GUI element now has the preview button turned on by default.

Double clicking on a file in the results view window now opens it.

Added a file preview button for the spectrum.read_intensities user function GUI page.

Added a file preview button to the file selection GUI element of the wizards.

This is currently activated for the sequence.read user function.