* gash/commands/mv.scm: New file.
* gash/bournish-commands.scm: Use it.
* build-aux/build-guile.sh: Compile it.
* configure: Wrap it.
* .gitignore: Ignore it.
* gash/commands/mkdir.scm: New file.
* build-aux/build-guile.sh: Compile it.
* configure: Create script.
* gash/bournish-commands.scm (mkdir-command): New variable.
(%bournish-commands): Add it.