Modify Makefile to behave in the expected way; 'make install' uploads to cobolworx.com

Can you please partially revert this change? Most of this is most reasonable but `make install` is also something that is "expected to install locally". I therefore suggest the following changes: * rename current `install` target to `upload` * possibly use a make variable for the scp target (defaulting to the current version) * re-add the `install` target (maybe renamed to local-install) to install the previously created extension (which it depends on and therefore will create if missing) * use a make variable for `CODE`, defaulting to `code` (allowing people to specify a path to it and/or change it to codium)