Merge pull request #104 from trontrytel/master

wip on spreading drop test with iga
some more asserts...
Merge branch 'master' of github.com:slayoo/libmpdataxx
moving asserts in shallow water from the test into shallow_water_common
introducing epsilong to beta_up and beta_dn for iga only
fixing fct in 3d
sync
Merge github.com:mwarusz/libmpdataxx
fixing GC_mono ranges in fct 2d/3d
commenting out epsilons in fct iga formulae - rounding mode settings per Macieks suggestion help
removing multiple real_t definitions from tests
adding setting of rouding mode to compile-time opts
adding a workaround for missing Blitz include for Clang to work in Debug mode
fixing assert in donorcell_1d
comments only
renaming round_mode -> fp_round_mode (to group fp_ options)
fixing real_t=real_t issue in harmosc (gcc complained)
changing obsolete finite() calls into std::isfinite()
sts:: -> std::
sts:: -> std::