[mdt-ocl.dev] 6.2 and Xtext compatibility

[Ed Willink <ed@xxxxxxxxxxxxx>]

Hi

See https://bugs.eclipse.org/bugs/show_bug.cgi?id=481867

It has not been possible to accommodate the breaking API changes in 
Xtext 2.9, consequently the Neon 6.1 release editors must be generated 
with Xtext 2.8.4. This is a pain for OCL development and ripples to all 
re-users of the OCL grammars, such as QVT.

I therefore propose to create a 'no-change' 6.2 release that is built 
using Xtext 2.10 and imposes much tighter lowerbounds on dependencies.

Luna/Mars/Neon users can therefore use the 6.1 Neon release.

Neon/... developers can use the 6.2 release / GIT master.

(If Xtext supports VSCode's Language Server Protocol (see ide-dev thread 
today) then no doubt another major change is on the way.)

    Regards

        Ed Willink