stricter interexchange test
AFM exchange test
automate regression006 test
cleanup exchange
inter-exchange is extension
update py racetrack example
ext_dwpos now in lab frame (Thanks Lasse Laurson)
fix interexchange tests
update docs: mumax3.4
fix kernel symmetry bug
make interexchange2 test consistent with standardproblem4
settable demag accuracy
fixup regression006 test
settable gammaLL