CWAS mask business

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
simple cwas documentation change

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
Added dtype option for loading functionals; cleaned up creating joint mask

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
Give dtype option to calc_cwas

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
basic functions for calculating memory limits

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
updated computing subdists with memory limit to compute voxels by blocks and dtype

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
subdists

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
update mdmr to compute voxels by chunks

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
calc_cwas business

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>