Clean up install script/process

Right now the default way to install FLAG is to source the dibas.bash script in /home/groups/flag/dibas to setup the environment and then run the FLAG install script in the root level repo directory. However, if you wanted to install FLAG in a location other than `/home/groups/flag/hash/ you would have to update your path for that session. And so this is kind of a chicken and the egg situation.

It seems the best thing to do may be to have the dibas.conf script generated by the install script that is then sourced after building each time using flag.