Adjustments to character positions less than one pixel are ignored.
These adjustments are probably introduced by lossy conversions between
integer based and float based coordinates.

DXArray elements are adjusted to integers avoiding cummulated rounding
differences.

Change-Id: I65d476301247251a7d329b14adb70be367538c97
Reviewed-on: https://gerrit.libreoffice.org/15633Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Khaled Hosny <khaledhosny@eglug.org>