Bintable data better support, tile compressed image (gzip and rice), additional things

[bmatthieu3]

This PR contains:

• A better support for the bintable extension parsing with variable length array support (seeking into the heap associated to a binary table)
• W.I.P: tile compressed image convention. Only GZIP and RICE compression algorithm will be supported. For the moment only tiles with ZBITPIX refering to U8 (byte), I16 (short) and I32 (integer) is supported. The quantization method for handling floating point tiles is not done in that PR
• Jumping to the next HDU uses the Seek trait (optimization)
• On image extensions: it is possible from the ImageData object to only seek for a specific pixel
• Introducing of the log crate thanks to the reference given by Log parsing errors to stderr #18 . Logging is used here for warning the user if the parsing did not find some cards. This should be rebase on the work of Comments, continued, strings, card as enum, etc #16