relaxed version constraint
[404237] Fixed: treating container refs as directly untraversable
 ASSIGNED - internal error (duplicate deletion) when replacing the root
element of an EMF instance model 
 https://bugs.eclipse.org/bugs/show_bug.cgi?id=404237
[403324] Better error handling during viewer updates
[398720] Extended target platform based metamodelprovider
 REOPENED - Enable importing EPackages registered by target platform 
 https://bugs.eclipse.org/bugs/show_bug.cgi?id=398720
[403659] Fixed incorrect precondition
[401314] Turning off code generator in case of errors in eiq file
[398636] Pattern Registry Runtime - ASSIGNED
Prototype listener before builder change tracking approach.
https://bugs.eclipse.org/bugs/show_bug.cgi?id=398636
[404402] Changes to outline provider - hopeful fix to issue
Updated build system to use the final Tycho 0.17.0
Experimental method NavigationHelper.cheapMoveTo()
[404465] Added error dialog on editor open in case of invalid project
fix for cheapMoveTo
[404395] Fixed by obsoleting countChecker beta joins
 ASSIGNED - pattern is not matched when using 1 == count and the model
is incrementally modified 
 https://bugs.eclipse.org/bugs/show_bug.cgi?id=404395
Further fix for cheapMoveTo
[398825] Updated mismatched token parser error messages
[398791] Marking mismatched package names as errors
[398791] Test case update
Fixed an NPE in builder
cheapMoveTo for to-one containments
added engine-based set initialization method into observables