CheckSezpoz: also handle test classes

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Fix AppUtils test on Windows

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The URLClassLoader in ClassUtilTest does not release .jar files
easily...

Only with Java 7 does the URLClassLoader get a 'close()' method... So
for now, we simply delete the .jar file on exit, to help Windows
which likes to lock files far too much.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Fix FileUtilsTest for Windows

We used POSIX paths which Windows (like so many other sane things)
cannot really grok.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>