Opencv eigen (#6014)
Opencv eigen (#6014)

* Added a package for the MDAnalysis toolkit.

* Changed dependency for the eigen library to not include support for
multiple-precision (arbitrary-precision) floating point arithmetic,
since OpenCV does not support these data types.

* Fixed incorrect implementation

krafczyk/spack,skosukhin/spack,iulian787/spack,krafczyk/spack,LLNL/spack,mfherbst/spack,lgarren/spack,LLNL/spack,EmreAtes/spack,LLNL/spack,matthiasdiener/spack,lgarren/spack,EmreAtes/spack,iulian787/spack,krafczyk/spack,mfherbst/spack,matthiasdiener/spack,iulian787/spack,EmreAtes/spack,tmerrick1/spack,matthiasdiener/spack,LLNL/spack,skosukhin/spack,krafczyk/spack,tmerrick1/spack,lgarren/spack,mfherbst/spack,lgarren/spack,tmerrick1/spack,EmreAtes/spack,mfherbst/spack,tmerrick1/spack,LLNL/spack,matthiasdiener/spack,skosukhin/spack,matthiasdiener/spack,iulian787/spack,krafczyk/spack,EmreAtes/spack,iulian787/spack,skosukhin/spack,tmerrick1/spack,lgarren/spack,mfherbst/spack,skosukhin/spack