adapt formatting to narrow screens, do not crash, fixes #1628
adapt formatting to narrow screens, do not crash, fixes #1628

when screen width was too narrow, the {space} placeholder could get negative,
which crashes as it is a width specification.

now we simplify progress output if screen is narrow.
we stop output completely if screen is ridiculously narrow.

raxenak/borg,edgewood/borg,RonnyPfannschmidt/borg,edgimar/borg,raxenak/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,edgewood/borg,edgimar/borg,edgewood/borg,RonnyPfannschmidt/borg,edgimar/borg,RonnyPfannschmidt/borg,raxenak/borg,raxenak/borg,edgewood/borg,edgimar/borg