- kill completion: do not even start fzf on non-empty word
- host completion: start fzf with initial query

- Use tput sc/rc instead of redraw-current-line
- Escape selected items with printf

This reverts commit 2d3a0a10
(which doesn't make any noticeable difference)

This commit is the workaround for the curses issue where the query
string on the screen is truncated after the cursor when the list is
updated: e.g. `aaac|bbb`

~/abc/def/ghi** should match ghi under ~/abc/def/, not ~/abc/def*

Conflicts:
	fzf-completion.bash

Prototype implementation of bash auto-completion