eq_dv - tests for content equality between vectors of double
array array -> bool
Deep equality test since regular eq is an identity test for vectors.
Intent is to be used in mathematica.sli to override eq for
doublevectortype.
Example:
<. 1 .> <. 1 .> eq_ --> false
<. 1 .> <. 1 .> eq_dv --> true
two array of doubles
Peyser
/usr/src/packages/BUILD/sli/sliarray.cc