fix checking satisfactory continuous model of MinSpareNode and MaxSpareNode constraints.
Merge remote-tracking branch 'origin/develop' into develop

Conflicts:
	SpareResource/src/main/java/btrplace/model/constraint/MaxSpareNode.java
	SpareResource/src/main/java/btrplace/model/constraint/MinSpareNode.java
	SpareResource/src/test/java/btrplace/solver/choco/constraint/CMaxSpareNodeTest.java
fix checking satisfactory continuous model of MinSpareNode and MaxSpareNode constraints.