Add 'make install' to Makefile

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Improve debugging in printer test

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Fix marshalling error in SetColourMapEntries

We were marshalling the RGB map on top of the header.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>