Removed Git SHA1 and Branch from compile definitions on files except FieldIO.cpp

Changed FieldMetadataMap to use string values instead of NekDouble.

Better searching for zlib in macports directory.
Fix to zlib source to work with OSX.
Added check that patch version is 7 or later
(we need 1.2.7, but only check the patch level at the moment)

Explicitly reference ZLIB_LIBRARY in Cmake, rather than the Boost version.

Removed Cannot Find Boost warnings.
Added status messages for each library found or built.

Moved QT4 search to ThirdParty module.
Tidied up other parts of cardiac solver code.

Updated FindMetis cmake file to reflect new library.

Modified graph partitioning routine to new API
Temporarily disabled calls to AS_METIS_NodeND.