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FindHDF5.cmake improvements, 1.0 branch (2018.01.31.)

Attila Krasznahorkay requested to merge akraszna/atlasexternals:FindHDF5Improvements-1.0-20180131 into 1.0

Updated FindHDF5.cmake not to be confused by the HDF5 version installed by the system on lxplus. By default the module will now ignore anything installed under /usr, the user has to explicitly tell the build to consider /usr, when on something other than SLC6. (Using export HDF5_ROOT=/usr.)

This is meant to replace !205 (closed), as a bit more robust implementation.

Note that I also taught LCGConfig.cmake to find LCG's version of HDF5, in case we ever want to just use the version provided by LCG in some project.

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