bgssh-add improvements, bgssl, bgdu improvements, bgswap and more

bgssl - shortcut to inspect a cert with frequently-used options
bgdu now shows hissen files and sorts
bgswap - shows swap usage on Linux
git cc - checkout master
git logs decorated
Other fixes

Fix bug: Use new .bgrc.cfg in deploy_bgrc()

.bgrc.cfg was source from ${HOME} in deploy_bgrc(). If ${sourcelocation} was customised this would mean that the default would be used instead of the customised version transferred into .bgrctemp/ .

Customise source .bgrc location, bgssh-add and bug fixes

• Bug fixes
• Explicitly add set nc to vimrc
• Long ISO 8601 dates in ls
• Customise source .bgrc location
• bgssh-add

Deploying more configurable and scp failback fix.

Allow skipping of bgscreenrc and bgvimrc to be configurable in .bgrc.cfg

Fix scp failback.

.screenrc and .vimrc deploy is skipped if custom version exists

Major refactoring of deploy_bgrc to send a function to the remote to allow script logic to be applied there. As part of this work there is now unified logic whether the deploy is to local or remote.