Reduce memory consumption of source coordinates

Reduce memory consumption of source coordinates

Reduce memory consumption by storing source location coordinates
as 16-bit variables (in run-time structures).  Also modify qmlmin
to restrict line lengths so that the column bound is not normally
exceeded.

Change-Id: I08605626ffbdf081b6da2aea1116bdfe24998572
Reviewed-by: Yann Bodson <yann.bodson@nokia.com>