Run 'make update-copyright'.
* examples/c++/README.md, examples/c++/calc++/README.md, * examples/c/calc/README.md, examples/c/lexcalc/README.md, * examples/c/pushcalc/README.md, examples/c/reccalc/README.md: Prefer the GFDL banner to the GPL one.
Currently we have no simple example: rpcalc in reverse Polish, mfcalc has functions, and lexcalc is using lex. * examples/c/calc/Makefile, examples/c/calc/calc.y, * examples/c/calc/calc.test, examples/c/calc/local.mk: New.