add defines for debug and testing modes

[aenachescu]

Each bitmap mask should have a flag for debug mode and testing mode. We can reserve 0x80000000 and 0x40000000 or we can use specialized flags for each bitmap mask.
The first case:
PRO: you don't have to remember to add the specialized flags
CON: each bitmap mask must have 4bytes

The second case:
PRO: masks can have different sizes
CON: there is a chance to forget to add the specialized flags