I'm not sure when this regressed (perhaps a bad merge at some point),

but running commands that use repositories were not loading

configuration from the TREES setting first. This meant that if a given

checkout required configuration from that setting in order to properly

initialize the repository, commands would error out.
This change reorders things so we load data from TREES before requiring

the repository to be present.

Successfully used rbt stamp in a checkout that required TREES.