2010-12-20

Binary blocks can be compressed using cmpr.h/.c. Two compression 
modes have been defined:

  Compression = None | GzipCompression | ZCompression

The compression uses zlib (http://www.zlib.net/). 

To write a compressed binary section the function

  edf_set_datacompression ( compression );

must be called before edf_write_data and edf_write_data_raw.

The compression mode stays active until the next call of 
edf_set_datacompression.

For the moment compression cannot be selected from the programs. 
However, compressed binary blocks are uncompressed during reading.
