[BioC] bugfix in affxparser for BioC release 1.9

[Kasper Daniel Hansen]

A number of bugfixes have been incorporated into affxparser for the  
Bioconductor 1.9 release. This bumps the version number to 1.6.2. The  
update fixes a number of memory bugs that can cause a crash, mainly  
related to frequently reading small chunks of a CDF file. The update  
is recommended for all users.

Bugfixes:
* Memory bug in the Fusion SDK when reading many
   small chunks of a cdf file
   (affected file: fusion_sdk/file/CDFFileData.cpp
* Problems when reading non-null terminated strings
   (affected file: R_affx_cdf_extras.cpp)
* Small problem when using readCdfUnits with the argument
   stratifyBy = "mm" - it returned pm values instead of mm.

Kasper