#2 'compress' compressed files are not read.

[Cris Luengo]

This is an issue that has been bugging me a little bit
for a long time. SCIL_Image generates IDS files that
are compressed using 'compress', the UNIX utility. I
haven't been able to find a library that decompresses
these files (but haven't looked very hard either).

[Cris Luengo]

Logged In: YES
user_id=1292582

At some point I'll put in some code from ncompress to be
able to decompress these files. But we'll never allow people
to write using the 'compress' compression. gzip is better.

[Cris Luengo]

I've finally put in the ncompress code to read .ids.Z files. The code is not able to read the data in blocks, the whole image has to be read in one go. Only version 1 ICS files can be COMPRESS-compressed, if the file is version 2 ICS, it is assumed to be gzip compressed if the compression flag is 'compress'.