Get TIFF physical resolution load / save sorted out
Neaten up multi-element property handling by using fusion vectors, and switch extrasamples property to work in this way. Add ability to load and save ICC colour profile information.
Minor changes for extraneous duplicate line, and constness
Improve handling of multi-valued properties in TIFF, and fix some problems with ICC profiles in PNG
Minor header / indent correction
whitespace
Whitespace tidying, and default TIFF resolution (which is compulsory) to 1,1 (which I hope / think means square pixels of unknown size).
Whitespace
Correct header inclusion
Merge branch 'feature/icc-profile-io' of https://github.com/gallafent/gil into develop