a) test export/templates/ectaart_pdf5 removed, because
of incompatibility between ectart.cls and luatex.sty
b) renamed some tests to reflect their purpose
tex2lyx2lyx/roundtrip/ => tex2lyx/cmplyx/
# the tests are comparing files written by lyx (not by tex2lyx)
autotests/ => keytest/
# we are testing reactions of lyx to some key strokes
c) add tests for lyx2lyx. This is rather rudimental, in that it only
checks for created output, error codes and error output.
d) use correct environment variable to set up the userdir for testing
