[ublas] include error in concepts.hpp

From: Shawn D. Pautz (sdpautz_at_[hidden])
Date: 2008-06-27 12:28:49

The file ublas/detail/concepts.hpp makes explicit reference to the ublas 
vector and matrix classes.  However, it only includes 
boost/concept_check.hpp, so it does not see even a declaration of those 
classes, thus requiring external clients to include those header files 
for it.  This file should be fixed to include the required headers or by 
eliminating use of concrete classes.

Shawn Pautz