Log Message:
Various nit-fixes:
* When running rox, the user needs rw access to the CHOICESPATH. The rox
  startup script assists by making a directory of defaults in the user's
  home directory and setting CHOICESPATH if it unset. This fixes bug
  noted by Rui-Xiang Guo in a private e-mail.
* rox-base now owns the share/rox and libexec/rox directories.
* the installation is handled slightly better (e.g. now make deinstall &&
  make install will work).
* Bump to nb2.