Use text properties instead of truncating strings

Use text properties instead of truncating strings

* lisp/emacs-lisp/tabulated-list.el (tabulated-list-put-tag): Use
this to allow using commands like `C-s' to search for even
truncated bits.

* lisp/international/mule-util.el (truncate-string-to-width):
Allow using text properties to truncate strings instead of
actually truncating strings (bug#17782).