Bug #21 add more tests - find more problems.
bug #21 negative numbers are not the only problem.
Merge branch 'develop' of ssh://git.code.sf.net/p/uiq3/git into develop
Merge branch 'release/7.2.4' into develop
Merge branch 'release/7.2.4'
7.2.4 Fix one (hopefully) last null pointer problem in FX-603P.
Bug #20 Update version number and history
x^(1/y) mit x=0 funktioniert nicht