almost ready for interleaved permutation test
remove 32-bit special cases
okay, here goes nothing
initial compile warnings/errors fixed
some 64-bit bugfixes.  (32-bit bugs remain.)
time to give non-interlaced a try
bugfixes
xchr bugfixes
switch back to 2-bit permutation storage
bugfixes
more bugfixes
time to restore all other --assoc/--model permutation functions
dom/rec restored
trend
gen mperm
bugfix