admin: dist Doxyfile
admin: update scripts/dist for squeeze
admin: use hardening includes when building .deb
admin: autogen.sh now uses autoreconf
doc: typos
doc: more design notes
doc: link from arch diagram
test: unit test for format_usergroup
doc: typo
format: test sigset formatting
format: whitespace hygiene for supplementary group list

Use comma instread of space for separator and "-" if the list is empty.
Maintains the rule that columns are never empty, for the benefit of
people parsing the output with awk or similar.
doc: state some goals and non-goals