User Guide, Chapter 10: ECJ installation info is out of date

[mbeyeler]

• Need to document about installing ECJ (basically the steps, after downloading the .jar file from the hyperlink, which include unzipping it, using 'make' on it, and moving it to the appropriate directory).
• Need to mention the additional software tools required to support ECJ such as 'openjdk', 'ant' etc. Also mention the software VERSIONS that work and the ones that don't, since this is a very common issue.
• Say how you can verify that ECJ is installed correctly, and if not, what steps to take in order to solve the issue or reinstall ECJ.
• Remove comment about tools/ecj_pti/user.mk since in the current version of CARLsim there is only one 'user.mk' file which already contains the appropriately set ECJ environment variables. But should mention that the variables (specifically $ECJ_JAR) might need to be modified if a different or newer version of ECJ is installed other than ECJ 22 (or else the 'ec package not found' error persists).
• Maybe add some general tips and troubleshooting techniques about download and installation