Add an option to hide the logged user

LP_USER_ALWAYS=1 will display the user, even if he is the same than the logged one.
Defaults to 1 (always display the user), set to 0 if you want to hide the logged user (it will always display different users).
Merge branch 'lp_as_title' of ssh://localhost:8480/nojhan/liquidprompt into lp_as_title
Escape configured sequences instead of bash ones ; bugfix: parse the whole prompt as a title ; LP_ENABLE_TITLE in the rc ; indent fixes