Add some graphviz-layout specific commands Quoting improvements, so that e.g. VLAN interfaces link correctly Add trial code for alternate label places
Not all systems provide for a "readlink" with options, so we emulate what we need.
This simplifies the scripts somewhat and the autoconf system quite a bit. To specify a non-default location for the config, export a directory in FIREHOL_OVERRIDE_PROGRAM_DIR and ensure it has an install.config and functions.common.
