relax SVN archive

Added peak lists for the 3-parameter exponential decay curve fitting.

The peak lists were copied from the ones for the 2-parameter fitting using:

svn cp test_suite/shared_data/curve_fitting/T2_ncyc11_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc11_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc11b_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc11b_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc1_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc1_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc1_ave.lisbt test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc1b_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc2_ave.lisbt test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc2_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc1b_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc1b_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc2_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc2_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc4_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc4_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc4b_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc4b_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc6_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc6_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc9_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc9_ave.list
svn cp test_suite/shared_data/curve_fitting/T2_ncyc9b_ave.list test_suite/shared_data/curve_fitting/T1_inv-recov_ncyc9b_ave.list

Removed the 5 pt spacer after the next button in the wizard as the 15 pt spacer comes straight after.

Consistent sizing and better spacing of the wizard buttons.

Fixes for how wizard pages are displayed sequentially.

This is now functional.

The cancel button now destroys the wizard dialog and is not a panel method any more.

There is still a bug causing segfaults when the dialog is destroyed!

Too many empty lines.

The back and next buttons are now partially functional.

The icons are displayed and the go_back() and go_next() methods are executed. But there are still
bugs and the page layout is incorrect.

Added the next navigation icons to the paths module.

Added 22x22 Oxygen icons for the back and next wizard buttons.

The buttons are now added to the wizards.

The add_button() method has been converted to build_buttons() and is executed at the start of the
run() wizard method.