Dump Installation files by machine

[gtrabanco]

If you have a work and personal computer would be great if when you dump your packages (and settings in macOS) this is done, with the hostname as file name or in a folder with that hostname.

Later when you import, if the hostname is not present with fzf it can show you a list of machines because maybe you want to use any configuration of a machine or use as a new configuration machine.

I could do this but this feature mix some files.

[gtrabanco]

Done with PR #114 which is now pending approval

[gtrabanco]

Finally this was not added to Dotly