* configure.ac: Do not treat scripts/geesh as an AC_CONFIG_FILE.
* Makefile.am: Do the substitutions here (at make-time).
* scripts/geesh.in: Update %load-path and %load-compiled-path
explicitly before loading anything.
* geesh/repl.scm (run-repl): Add optional port parameter.
* scripts/geesh.in: Add '--command' and '--stdin' flags, and if
neither flag is provided, treat the first argument as a file to
interpret.