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QuadPrecision

The toolkit is moving towards supporting quad-precision (via the __float128 GNU quadmath library), and possibly to higher precision via the GMP library.

Moving to quad precision involves several issues

• treatment of constants, eg pi, sqrt2, etc need float128 support
• BLAS/LAPACK library, it looks like a good candidate is MPACK
• EXPOKIT needs porting to __float128. Or maybe use a different library, see eg http://people.sc.fsu.edu/~jburkardt/f_src/matrix_exponential/matrix_exponential.html
• ARPACK needs porting to __float128. Probably a big job, but maybe someone has already done it?
• Handling adjustable parameters, for example eigensolver tolerances, and default values.