add utility to split bufr files by subsets. about nceplibs-bufr HOT 5 CLOSED

1. There's some issue here with nomenclature in comments concerning the distinction between a message type/subtype and a subset. A message type/subtype (lets say MTS for short) combination defines a subset template. For example the tag NC005064 is an MTS which will contain subsets defined by elements, operators and sequences found in bufr tables a, b, c, and d for that MTS . Each MTS file usually contains many subsets. The code here collates messages from a bufr file in its MTS components. Its mostly my fault and I should fix it.
2. I wonder why the test failed. I can guess that maybe the exemplar might have slightly different fortran control words for unformatted files or something like that. Are the files being compared available somewhere I could llok at them?

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@jack-woollen
re. 2 The split_by_subset.x test fails because we have not uploaded the test files to the ftp directory. Once it is uploaded, the test will pass.

My bufr is weak, so I don't fully understand the language. I think what you are suggesting here is that this program is actually; split_by_MTS rather than split_by_subset. subsets are still present in the split files. Thanks for the clarification. May be I should rename this to split_by_MTS or something else other than subset.

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It could be split_by_subset_type. I'd like to change some of the comments as well.

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@jack-woollen
Feel free to clone the branch and commit to it.

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@aerorahul Will do.

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