#295 Metadata checksum comment about line endings should be moved

[Terry O'Neill]

Some files (xml, plain text, svg, microsoft project) when normalised give a comment under metadata:exported_checksum -> metadata:comments of:
The export checksum of this file may differ as different operating systems use different line endings.

This comment really belongs with the metadata of the package as it is really saying that the conversion may produce different output results with respect to line endings depending on which machine it will runs (which of course will result in a different checksum). Having this comment against the checksum is potentially deceiving.