Please rename "DEBUG" macro in ZXing source

[notarysojac]

Hi ZXing folks - 

Would you be so kind as to rename the DEBUG macro (and references in the course code) to something like __ZXING_DEBUG__ ?

There are numerous uses of DEBUG in many projects and I would like to be able to control the definitions for all such masking macros in my .PCH file

It's a namespace-thing... I'm just sayin'... 

THANKS!