Started documenting slicing.
reverted one more parser class
Merge branch 'master' of https://github.com/cwi-swat/rascal.git
Working on documentation.
Documented precision functions
Regenerated parser after recent undo of parser generator fixes
Set up some tests for forking/concurrency
Start making environment unmodifiable
Merge branch 'master' into eval-fork
Don't keep direct refs to imported modules in ModuleEnvironment
Make JavaBridge thread safe (I hope...)
Update copyright notices