Changes

Added IR nodes and cases for ASetPattern and AUnionPattern.

Add "opaque" label to types' toString

Change (opaque) label to /* opaque */

Check for nil values in InvariantValue equalities, fixes #717

Adds Overture 2.7.4 release notes

Preparing the release of Overture 2.7.4

Revert "Merge pull request #714 from SamieJim/js/ir"

This reverts commit 87e8945dbf2bc95bdd7ff9ffd90e784c9422cec4, reversing
changes made to 51351ae505504fd4bef82f2c2b0429c7bd876f42.

Those commits break the javagen tests according to issue #718

[maven-release-plugin] prepare release Release/2.7.4

Bump ide/ to version 2.7.4

[maven-release-plugin] prepare for next development iteration

Bump ide/ to version 2.7.5-SNAPSHOT

Do not report mutual recursion via pre/post expressions, fixes #719

Correct check for cyclic recursion, fixes #720

Update test results for recursive cycle check

Fixes #721

Adds project subfolders to the path when converting the full debugging URI path
to a file name that must be found relative to the project path.

Relativizes URI to the project files location. Fixes #721.

Previous correction worked only for projects stored under a workspace,
because it used the workspace folder location to relativize file paths.

In case a user imports projects and maintains the files in another
location outside the Eclipse workspace folder, this fix provides the
appropriate paths.