- the sapply() calls in the instrument wrappers now use simplify=FALSE is 
   assign_i is FALSE so that a list of instruments is returned.  Named lists
   of instruments are easy to work with since they can be passed directly to
   (re)loadInstruments(), or coerced to an environment with as.environment()
 - added some tests



git-svn-id: svn://svn.r-forge.r-project.org/svnroot/blotter/pkg/FinancialInstrument@1474 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
 When loadInstruments() is called with a list, it now assigns instruments to their primary_ids found in the instrument instead of to the names of the list.  In addition to being safer, this allows for unnamed lists to be read as easily as named lists.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/blotter/pkg/FinancialInstrument@1475 edb9625f-4e0d-4859-8d74-9fd3b1da38cb