Draw both coords in a1

The lower-left board square needed two inscriptions, but DrawOneSquare()
only allowed one, so that the file ID would not be written. Now two strings
can be passed, and when align > 1 to indicate the alignment of the top
string, it is still checked if a bottom string is present as well, which
then is drawn with alignment 1 (= bottom right).
 The rank coord or piece count can now also be double digit.
Add boolean -autoBox option

This option controls the automatic popup of the ICS Input Box on typing
a printable character, which was annoing to some. The option can be
set from the ICS Options dialog.
Update NEWS file
Add desktop stuff for .xop MIME type.

Icons and desktop file were missing, as was the automake code to package them.
Remove empty-square SVG images from project