pigpen/Makefile.am (pkgguilesitedir): Fix the path
utils/pigpen.in: Add to the repository

* utils/pigpen.in: Add to the repository
* utils/Makefile.am, utils/.gitignore: Likewise.
* Makefile.am (SUBDIRS): Add `utils'.
* configure.ac (AC_CONFIG_FILES): Add `utils/Makefile'.