ptscotch - compiles into ptscotchDecomp. All thirdparty decompositionMethods
now moved out of decompositionMethods so add them explicitly to link line
for programs that need them (decomposePar, snappyHexMesh etc.)
- in preparation for adding an optional '-reconstruct' to a few utilities
re-use as -lreconstruct library
- move related stuff there too
src/decompositionMethods/decompositionMethods
-> src/parallel/decompositionMethods
- added missing namespace qualifiers