depends+license: use boolean masking on arrow of rownames instead of directly on...

depends+license: use boolean masking on arrow of rownames instead of directly on available when reversing arcs. typo in license simplification.

since R, like MATLAB, treats containers as size 1 as scalars (at least
in some cases), it seems that foo[x,drop = F] where x is a container has
sometimes surprising results (e.g., forgetting rownames), particularly
when x is of size 1 and/or foo is of size 1.  instead only deal with the
form where foo is one dimensional -- this at least seems ok.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/cran2deb@62 edb9625f-4e0d-4859-8d74-9fd3b1da38cb