Add support for running shell scripts as tests

Signed-off-by: Michael Buesch <m@bues.ch>
Add small test for awlsim-server

Signed-off-by: Michael Buesch <m@bues.ch>
Remove workarounds for sqrt and ln jython bugs

These bugs are fixed in upstream hg repository

Signed-off-by: Michael Buesch <m@bues.ch>