journalctl aliases
a couple of helper aliases
add autogenerated airline prompt

See https://github.com/edkolev/promptline.vim

Config:

    let g:promptline_preset = {
                \'a': [ promptline#slices#cwd() ],
                \'b': ['${vcs_info_msg_0_}'],
                \'c': ['%l'],
                \'warn': [ promptline#slices#last_exit_code() ],
                \'options': {
                    \'left_sections': [ 'a', 'b', 'c', 'warn' ],
                    \'left_only_sections': [ 'a', 'b', 'c', 'warn' ],
                    \}
                \}