Resize the IndexSet when there is no interaction By default, the size of IndexSet is LEVELMAX (999). This was not updated when there was no interaction. Thus a lot a time was spend going through IndexSet. Now the size of IndexSet is set to 0 if there is no interaction. A simulation with no relation is now 10 times faster. There is no visible regression.
Resize the IndexSet when there is no interaction
By default, the size of IndexSet is LEVELMAX (999). This was not updated
when there was no interaction. Thus a lot a time was spend going through
IndexSet. Now the size of IndexSet is set to 0 if there is no
interaction. A simulation with no relation is now 10 times faster.
There is no visible regression.

git-svn-id: de9bbed4c30e0eb58fe8e7d66f5c80b71699a07c@3010 bf01a9d7-0df3-0310-8ad4-b1c94d9ae2d5

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