README redone as a manpage
GNUmakefile with a generalization through $(name)

makes the diffs between my hobby projects a tad smaller.
Makefile: s/mkdir -p/$(INSTALL_DIR)/g
GNUmakefile: ws changes
GNUmakefile: install target is not silent

it looks like nothing happened, esp. after non-muted 'all'.
GNUmakefile: make sure all is built before installing

prevents possible foot-shootings from running 'all' or 'check'
as root; the root-owned files in the working copy are the least
of problems that could lead to.  the install target depends on
a sentry file which is touched when 'all' succeeds.