bump and doc
after several false starts, upstream errors are reported better now in
RTE (which fixes #137 for this case); there is a mish-mash of error styles in
the codebase, meaning that it takes a little to get the right ones to
pop at the right time when there is a cascade of things trying to be
"safe"; I'm now more interested in things failing hard and fast, leaving
the upper reaches to sort it out