Pretty printing for state vectors.
...and for blocksys, relax, and restrict messages.
BUGFIX: pretty state printing in "change list" for localfixpoint.
BUGFIX: "relax" command correction.
BUILD: trigger re-make of main and rg_main if common.h is touched.
BUILD: re-make automaton_io.o and interactive.o if common.h is touched.

These object files contain definitions from common.h; specifically,
GR1C_VERSION and GR1C_INTERACTIVE_PROMPT.
BUILD: delete temporary Mac-related files.
BUGFIX: "relax" command correction during interactive mode.
TRIV: Makefile date resolution is now at years.
DOC: add brief example interactive session.
DOC: Import install and intro pages from wiki at GitHub.com
Drop plan for "setindex" interactive command.
New interactive command: "printegoals".
DOC: indicate "realizable" interactive command is not yet implemented.
TEST: add "printegoals" to scripted interaction.
Add Inf as possible return value for interactive command "getindex".
Increase buffer size for interactive input.
TEST: interaction test against restrict/relax bug.
TEST: remove scripted tests for GNU Readline.
DOC: reference the appropriate tech report in patching.h