wip: port hotspin to double precission, passes all available tests. dump i/o is functional, but limited to single precission
revert dump i/o changes. needs more elegant solution
add type converters for data lists
fix dump i/o on the highest possible level
do not use ffast_math optimizations. so hotspin should now be IEEE 754-2008 compliant.
eliminate costy branching in Debye() function
return the 0/0 exception to the Debye function and reduce the number of integration points to 1000
optimize Debye module performance
make Debye test to be consistent with Journal of Physics and Chemistry of Solids 42, 861 (1981)
use single-precission Debye function as a temporal solution to poor Fermi/Kepler special functions performance