Fix MatNest IS creation and update test for API change, add to nightliesHg-commit: cfa7f4d44e96e923d8352be6a8d5e45dd53aea13
Change MatCreateNest public API to be consistent with MatSetValues, bug fix in DuplicateHg-commit: c45dbff17c236d3e5381dab4a89cc5d6a9782cd6
Add MatNestNote: example uses SNES and was erroneously placed in mat directory.Hg-commit: 1d45e7a1244851f034d3626bcb3a873a5b342dae
Added the Mat implementation "nest".Two tests were added which test the functionality of MATNEST and itsinteraction with VECNEST.Hg-commit: 5f49062d8b2e8fed808a23bff3ecc4b90b903a17
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