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to produce a release build (-O3) simply do "cmake -DCMAKE_BUILD_TYPE=Release .."

Impove error checking with GQ and fix Axisymmetriy evaluation on the axis

See merge request !40

Specify target when solving eigenvalue problem + use shift-and-invert spectral transform

See merge request !39

Form1, MCK -> Form1, MK: helps to get a relevant eigenvalue (i.e. not from the grad kernel) even with floats