[Gradle Release Plugin] - creating tag: '0.7.0'.

release: version to 0.6.0

Merge pull request #250 from alpha-asp/fix_239

Fix issue #239

Merge pull request #184 from alpha-asp/vsids_default

Make VSIDS the default branching heuristic.

Merge pull request #145 from alpha-asp/fix_144

Fix: Avoid duplicate work in ChoicePoint.recomputeActive

Fixing ConflictCause construction in ArrayAssignment, adding related …

…solver test.

Revert "Set up release plugin"

This reverts commit 9390372. Was a
bad idea.