linearly_independent_subset_finder.   I also made the add() function return
   a bool that tells you if it added its argument into the dictionary set
   or not.
 - Added a version of empirical_kernel_map::load() that accepts
   linearly_independent_subset_finder objects.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403615