K 10
svn:author
V 5
adamw
K 8
svn:date
V 27
2019-11-05T00:08:55.679624Z
K 7
svn:log
V 456
calc: Simplify and take maintainership

calc provides a horrific Makefile that uses ?= for nothing at all,
requiring the file to be mangled by hand. Still, it was a little
much for us to redefine every system command. `cp` is unlikely to
wander out of $PATH.

While here, add some options to not install some stuff. In particular,
make it possible to just install a simple usable calculator without
hundreds of scripts, functions, headers, and help files.

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