Hi folks,

This is a patch adding a new user option to suppress Calc’s startup
message.

By default, Calc prints a message like this during startup:

"Welcome to the GNU Emacs Calculator!  Press ? or M-x calc-help-prefix
for help, q to quit"

I find this a bit distracting, so I’d like to be able to silence it. The
attached patch adds an option to allow this along with a small test
harness and documentation in the NEWS file.

Please let me know if any changes are needed to the patch.

Thanks!