fix broken test
adjust hole structs to print better while still
preserving proper equality

fix 1384d2d2779938f7b2a6449b9f09fc8cc24de75a
distro-build/installer-exe: fix name convention
add `CORE_CONFIGURE_ARGS' to top-level makefile

Also, `#:configure' to build-farm configuration.
add configuration for a distribution name suffix

The suffix is intended for OS variants, such as "precise" for a Linux
variant that is build with Ubuntu 12.04 (Precise Pangolin).