Use java.util.zip tools to decode (inflate) AmiraMesh files instead of zjlib methods.

The zlib methods appear to be faulty.
Encode (deflate) using java.util.zip methods instead of the zjlib ones.
Remove unused imports.
Add progress bar updates.
Make call to static method correctly.
Correct typos
Fix bug when reading AmiraMesh files.

There was a missing -1 in the calculation of the voxel calibrations.
Allow Avizo files to be read as well.

Avizo uses exactly the same format as Amira but the first line starts by Avizo instead of AmiraMesh.
Remove jzlib dependency, now unnecessary.