localmag needs to be able to handle odd channel string endings

[paulf]

Localmag is primarily designed to work on oriented channels, mostly horizontals, but in some cases people have worked out attenuation relationships for vertical channels for a region (Won-Young Kim did this for the NE USA for instance). In a recent case, someone had HHA and HHB channels that they wanted to get magnitudes from...so there should be a way to designate the 3rd char orientation as horizontal of vertical that can be an option in localmag.

Perhaps:

AcceptAsHorizontal? ABC AcceptAsVertical? DEF

Or some such.