Tweak man page. Factor out repeated code in if/else branches in send_gotconfig_remotes(). ok stsp@

Feature requested by naddy. ok naddy, who also suggested some tweaks that will arrive shortly

Make use of this in 'got clone' to persist -R option arguments given on the command line in the cloned repository's got.conf(5) file.

Set fetch-all-branches in the got.conf(5) file created by 'got clone -a' in order to make a future 'got fetch' act like 'got fetch -a' by default.

ok tracey

ok tracey