More renaming and reorganization of feature checks.

There were a couple of functions is_something(dgn_feature_type feat) defined in travel.cc that were otherwise independent of travel. For consistency, move these to terrain.cc and rename to feat_is_something.

One might also consider renaming the various feat_is_whatever functions to just is_whatever.

Created by  Robert Vollmert  on October 17, 2009
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