inoutlayerpots ignores TE/TM matching conds

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Currently segment.addinoutlayerpots only works for TM matching.
Different weights of layerpots in and out would be needed for TE or
other matching conditions - need to work this out. This may not be possible in 
the current segment-domain-basis framework - a new basis property such as 
domsweights may have to be added (analogous to doms)
Maybe have addinoutlayerpots check if matching conds exist and flag an error if 
not.

Original issue reported on code.google.com by [email protected] on 22 Jun 2010 at 7:04