[BioC] Support for binary cel files

[Ben Bolstad]

As of: affy 1.4.2 (in the developer section)

- Binary cel files should now be read properly by
ReadAffy()/read.affybatch(). 

- You may mix and match text, gzipped text (if supported on your
platform) and binary cel files in a single call to
ReadAffy()/read.affybatch(). Attempts will be made to automatically
determine the format of each file and process appropriately

- The compress flag is now ignored by ReadAffy()/read.affybatch()


Thanks,

Ben