Proofread XCF format specification.
Add outline, correct headlines. Chapter 1: rearrange, add URL to Cinepaint XCF format spec, wording. Replace 'Gimp' by 'GIMP', 'the GIMP' by 'GIMP'. Fix typo RIB->RGB, GIMP 3.3+, rearrange headline. Clarify: 'XCF' files from other software. Correct spelling. Remove trailing whitespaces.
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