Fixed nasty bug with multiple pre-load hooks.
Properly fixed inlines in hooks this time.
P:C working with _DEBUG -1.
y_master is now a y_hooks preload library.
y_groups called in the correct order again.
Colours_SAMPToGT in just one place.
Better test warning message.
Uses P:C not C:1.
COLOUR_GT_SPACE macro reverted to use precedence.