Fix a bug with some extracted qnx6 files not being readable.
Partial work on porting new QFileSystem class to Extract.
Finish up the new classes with QNX6, which needs some changes.
Re-organise how the images are processed. So we can inspect them before we extract.
Make the partition parsing a bit more robust and flexible.
Fix for autoloader table size.
Hook old progress code in to new progress emitter.