libalm.so is used by Stack & Tile as well as for the constraint-based
layout BALMLayout. This also adds libalm.so to the development package;
links it to /boot/system/development/lib.
* data files are still in the source tree.
* gutenprint headers contain a image.h header file which collides
with ours. This is solved by forcing include search first on
os/kernel directory.
