relax SVN archive

Modified the bug_17276 system test data so that there is some noise simulated.

Initialized merge tracking via "svnmerge" with revisions "1-11812" from
svn+ssh://bugman@.../svn/relax/1.3

A temporary branch for rearranging how peak lists and peak data is handled within the relax data store.

Bug #17276 is now triggered in the system test.

Added a system test for bug #17276.

This bug (https://gna.org/bugs/index.php?17276) was reported by Leanne Minall <lm7902 att bristol
dot ac dott uk>.

The test passes though as the problem is not in this test data.

The pipe.switch user function window now displays the cdp.

A user function base class method text() has been added for displaying info as text.

Added the xcf version of the pipe.switch graphic.

The pipe.switch graphic is now much more colourful.

The pipe.switch user function window now has a custom graphic.