Consolidated changes
Added Lab16 TIFF handling
Added TIFF16 Lab
remove duplicate variable assignments
testbed/testcms2.c: fix possible null pointer dereferences.
utils/jpgicc/iccjpeg.c: add comment about uint checked to be less than zero.
Remove unused variables.
testbed/testcms2.c: fix more type specifier mismatch and a variable shadowing.