QNX: Replaced physical screen size warning

On stock QNX it is quite common that libscreen doesn't provide the physical
screen size. The warning about this has been replaced with a debug statement,
because it was annoying especially when running auto tests.

Change-Id: Iab07f0d4a6293c40678f2ec3e77352e68797c8c7
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Fix roundtrip conversion of datetimes.

QDateTime.toString() is writing out milliseconds since change
15da0a5af20fe6771bcb94ef8d46edbd5c8fb64c. Unfortunately this breaks
QDateTime::fromString() with Qt::TextDate which can't handle the new
format.

Fix by making QDateTime::fromString split up seconds and milliseconds
on a period, if any. Now
QDateTime dt = ...;
assert(QDateTime::fromString(dt.toString(), Qt::TextDate) == dt)
works again.

Change-Id: Ibfe9032e357ceaf894e33f3e33affe94f56dbf5c
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
create a sub-tools target

for testing only.

Change-Id: I8ed63df9351bc40bbbbecd02489537a2daff768f
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>