Coming soon: Zip-Ada v.51, with a LZMA encoder

Coming soon: Zip-Ada v.51, with a LZMA encoder

[gautier_niouzes]

In a nutshell, a LZMA encoder has been added to the collection.
It is not a binding, nor a full literal translation of the C code,
but it has been written from scratch. Only a few portions such as the
bit encoder are translated. Other portions are mirrored from the decoder.
Some effort has been put to have clear identifiers and to make the
whole algorithm understandable.

List of changes for the upcoming version:
  - LZMA.Encoding has been added; it is a standalone compressor,
      see lzma_enc.adb for an example of use.
  - Zip.Compress provide now LZMA_1, LZMA_2 methods. In other words, you
      can use the LZMA compression with Zip.Create.
  - Zip.Compress.Deflate: Deflate_1 .. Deflate_3 compression is
      slightly better.

The sources can be retrieved from the following Subversion repository:
  https://sf.net/p/unzip-ada/code/HEAD/tree/
...or, if you prefer Git:
  https://github.com/svn2github/unzip-ada
  
Don't hesitate to test, play with, ask questions, report eventual bugs,
typos...
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