QCommandLineParser: add word-wrapping algorithm

Rather than breaking at column 79 precisely, break entire words,
to improve readability.

Change-Id: Ie30db00f0e6ed95cce87480c3b91804826c6076b
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
QHeaderView - do not ignore -1 as minimum section size

We claim that -1 is a special automatic value, but calling
setMinimumSectionSize with -1 is unfortunately ignored due a
regression in 524c3e05e811d81fbcd71eedb377b7eaa0a21ef3

Change-Id: I7d7e5dbbf78e561849d2f2352c9edb2df36aa181
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>