added new cool feature: support for Rascal plugins. All you need to do
is:
* create a Rascal project
* edit the MANIFEST to add a dependency on the rascal-eclipse plugin
* create a plugin.xml file which mentions the rascalLibrary plugin (no
attributes or parameters)
* make sure the new project is active in your run-time configuration for
the second level
* start a second level
* the project and also its Java classes will be available to Rascal
console and rascal parsers. For now Rascal modules should be located
always in the "src" folder.