BUG: Reading NMRPipe 3D/4D with last axes 1 or 2
BUG: Reading NMRPipe 3D/4D with last axes 1 or 2

Reading of NMRPipe files where the order of the axes ends with dimensions 1 or
2 is now possible.  Previously this would cause an error.

jjhelmus/nmrglue,kaustubhmote/nmrglue,jjhelmus/nmrglue,kaustubhmote/nmrglue