[NEW] Added ability to use StructuredMeshMapper multiple times, on different meshes, within a single simulation.



git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6988 04224531-1f84-46d8-96ce-875b9e37dce3
[FIX] fixed some memory leaks, and modified UpdateSolverMesh so it can be called without pre-existing Solver % Matrix being present.



git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6989 04224531-1f84-46d8-96ce-875b9e37dce3