ENH: Adding rank computing function
FIX: Adding to ref
FIX: Addressing comments
STY: Better variable naming
WIP: Moving toward improving match
FIX: Making inverse calculation more consistent
FIX: Dont want to set log level in test
FIX: Improving test coverage and old bug
STY: Better info
STY: Fixing colons
FIX: Allow re-calling of .as_diag()
STY: PEP8 and pyflakes
FIX: Making fixed orientation consistent
FIX: Better inverse matching
FIX: Fixing regression in mixed_norm
FIX: Minor fixes
FIX: Fixed versus loose orientation confirmation