Replicate the prompt in the title

Add an explicit option to replicate the whole computed liquid prompt in the window's title.
(Works with a vanilla xterm, but not under xterm-256 for me)
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
manual merge