Testsuite interaction problems



As part of my work on ODEs I have been adding tests.
Many of the tests in rtestode.mac are commented out,
as testsuite interaction problems make them fail.

I have filed a couple of bu reports about these:
 [ 612107 ] Test rtestode fails if run after rtest3
[ 619489 ] kill() does not kill compiled functions

I don't think I can fix the underlying bugs, but I may be able to
move the problem tests to the end of the testsuite.  Would these
changes be acceptable if they were relatively small?

If so, I will work on a patch for review.