Some fixes for build.xml

* fix libraries path;
* fix tests exclusion while compiling CLI jar;
* actually fail the build when tests fail.
Add a default configuration for the FPU

The FPU stores some configuration data inside a properties file, and the
current ways of accessing the properties file assumes that the simulator is
running from a JAR file. This is not always the case (e.g., while running unit
tests), so this commit adds a default configuration for the FPU, so that FPU
unit tests can be performed.

Filed Issue #25.
Add some debugging info to Parser and CPU
Add a basic FPU test