Properly import JSTL into System Management project

[bissim]

7f06caf introduces the jstl-1.2.jar library already in WEB-INF/lib folder of System Management front-end project as a work-around for PWC6188 problem about JSTL import in Jetty; however, library should be imported by Maven at compilation time.

[bissim]

As per 7c12106, looks like the only way to import the Java Standard Tag Library is by manually including its JAR in WEB-INF/lib folder.