NT: dorsal column-medial lemniscus pathway
PVs
Changing the rewrite of EHDAA2 such that the more general bounding
relations are used for starts and ends

Even though we can use the stricter interpretation locally for
EHDAA2 (with the exception of CS20), problems arise when we
combine this with Uberon, since equivalence axioms connect
what are probably mereological sums in EHDAA2 with grouping classes
in Uberon.

See #423
tidy
weaker interpretation for EMAPA stages. See #423