coredumpctl,man: mark truncated messages as such in output

coredumpctl,man: mark truncated messages as such in output

Unit systemd-coredump@1-3854-0.service is failed/failed, not counting it.
TIME                            PID   UID   GID SIG COREFILE  EXE
Fri 2017-02-24 11:11:00 EST   10002  1000  1000   6 none      /home/zbyszek/src/systemd-work/.libs/lt-Sat 2017-02-25 00:49:32 EST   26921     0     0  11 error     /usr/libexec/fprintd
Sat 2017-02-25 11:56:30 EST   30703  1000  1000   - -         /usr/bin/python3.5
Sat 2017-02-25 13:16:54 EST    3275  1000  1000  11 present   /usr/bin/bash
Sat 2017-02-25 17:25:40 EST    4049  1000  1000  11 truncated /usr/bin/bash

For info and gdb output, the filename is marked in red and "(truncated)" is
appended. (Red is necessary because the annotation is hard to see when running
under a pager.)

Fixed #3883.