Fixed up some "bio" related upgrade stuff, including protection against trying to upgrade sites that had already applied the upgrade against 5.5 (that script didn't make it into the repository however).
Moved "bio" back to "person", but with type-specific storage. People can fight over where such things belong on another day, for now keeping it in "person" has the advantage that the Tcl API is 100% unchanged so moving it to type-specific storage won't break .LRN.