* gash/commands/basename.scm: New file.
* build-aux/build-guile.sh: Compile it.
* configure: Create script.
* gash/bournish-commands.scm (basename-command): New variable.
(%bournish-commands): Add it.
* gash/commands/dirname.scm: New file.
* build-aux/build-guile.sh: Compile it.
* configure: Create script.
* gash/bournish-commands.scm (dirname-command): New variable.
(%bournish-commands): Add it.