Forum .LRN Q&A: Response to dotLRN some basic questions.

bboard will probably eventually be deprecated, due to its intrinsic datamodel problems, but will be continued in the tree until folks say it's OK to get rid of it.  Since there are existing sites out there that use it, we'll probably keep it around for some time and folks may want to maintain it, too, until they can switch to the new forums (after the new forum package is done and people decide they like it, which we hope they will).