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This reverts commit 2e1e671d.

This reverts commit b18f6cc1.

- eases management/control of previously calculated sums
- add empty() member function to SHA1Digest
- adjust Copyright dates

- update packing for FOAM_EXT_LIBBIN and newer FOAM_APPBIN
- pack OpenFOAM source via 'git archive' for consistency with
  the git repository (use -nogit option to revert to manual packing)
- combine foamPackBin + foamPackThirdPartyBin
- add foamPackThirdPartyBinAll (like foamPackBinAll)

- relocate service scripts into bin/tools
- use more standard 'tgz' instead of 'gtgz'

STYLE: minor rewording, drop grep/sed in favour of sed only

- remove settings for really old cmake versions

- place under $WM_THIRD_PARTY_DIR/lib/$WM_OPTIONS
- relocate FOAM_MPI_LIBBIN accordingly