- non-permanent content location (left or right)
- show current time
- prompt height (one or two lines)
- prompt spacing (with empty line between prompts or without)
- don't use typeset -p on zsh 5.4 as it's broken there
- remove redundant local declarations from _p9k_prompt_net_iface_async
- change the default value of POWERLEVEL9K_PUBLIC_IP_HOST as the old is broken