Split up calc_cwas code into distance and MDMR computation

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
Add cwas to __init__ file so it will be included in future installs

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
New tests of the mdmr wrapper function

Signed-off-by: Zarrar Shehzad <czarrar@gmail.com>
small fix to test feature

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