v0.7.1: Added detailed help and none encryption

[exa18]

.config 100% compatible with previews version shellcheck 100% valid * Added detailed help to show:

• defined backup dirs
• if is more prunes
• encryption kind
• shorten executable name * If Passphrase is empty then apply NONE for encryption. No longer error display.

[inkdot7]

@exa18 I'm sorry that I did not notice the comment on #2 two weeks ago. (I find the mail, but somehow lost it then...)

I have split the commit here into more individual changes, in the hope of making it easier for @Freaky to consider them one by one. They are available as a chain of commits here:

https://github.com/inkdot7/borg-backup.sh/tree/dev-0.7.x

The diff to https://github.com/exa18/borg-backup.sh/tree/dev-0.7.x is just one line where some trailing whitespace was omitted.

I think most of them are independent enough to survive shuffling by git rebase.

[exa18]

Sure, NP, seems it's OK. I'm sorry but not catched to split changes more :). ( hope next branch will be enough )