Change definition of -R command line option.

[JayDDee]

Changes are planned for the -R comand line option. It will no longer be a shortcut for
--retry-pause.

-R, --retry-pause=N time to pause between retries, in seconds (default: 30)

-R will be redefined and used for a new option to be introduced later.

Users who currently have scripts or configs that use -R should change them as soon as possible to use --retry-pause.

In the next release a warning message will be displayed when -R is used until the new
option is introduced.

[JayDDee]

Plans have accelerated. In the next release -R will have a new meaning.
There will be no warning message.

Users should be prepared. Change all your scripts, config files, bat files to use --retry-pause.

As a general rule config files and scripts should always use long options for clarity.

[JayDDee]

Change was implemented in release v3.9.7.