Feature request: validate TLM marker

[boxerab]

It should be possible to parse TLM marker and validate if all tile lengths are included.
Here is an example of an image with a corrupt TLM marker:

https://l3harrisgeospatial-webcontent.s3.amazonaws.com/MM_Samples/Pleiades_ORTHO_UTM_BUNDLE.zip

also, here is some code that parses a TLM marker

[bitsgalore]

Thanks, both the image and the code look really useful. TLM validation is already on the wish list as per issue 29, so I've added a comment there with your links.