Merge solver repo into Ippl
We (@muralikrishnan and @frey_m) decided to merge https://gitlab.psi.ch/OPAL/Libraries/ippl-solvers into this repo, but add a CMake flag ENABLE_SOLVERS.
Edited by frey_m
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We (@muralikrishnan and @frey_m) decided to merge https://gitlab.psi.ch/OPAL/Libraries/ippl-solvers into this repo, but add a CMake flag ENABLE_SOLVERS.