Added clarifications to readme

Contains a variety of data and specifications for the polar orbiting satellite series

Passes are flipped when northbound, not southbound

Why was this using a divide to calculate the difference?

Lack of clamping while reading a pixel from a palette resulted in reading invalid memory

Initial CMake support

Checking if the type string contains paletted instead of just the current image
leading to palettes attempting to be applied to images without a color buffer

Creating a paletted image along with other images broke it

I will tidy this up in the next few commits

Processing more than one image at once didn't work (quite bodgey)
MCIR would run even without a map
Error handling for map/raw images that don't exist

Allows custom filenames for the output image
Fix formatting in help text

The getsamples function is now able to only get samples from only one channel

Also improve land color in MCIR images

Lines are now only skipped before there is a detectable sync marker, but not after.
Simply removing the part responsible for recalclating pixel offset

Add linear equalise
Add image flip for southbound passes
Completly remove old falseclor in favour of a much simplier method

Add missing newline to usage text.