[osg-submissions] convert bitfields from magic numbers to bitshift notation

[Bob Kuehne]

hi robert, the attached are conversions of the 3 main places i found  
in osg where tokens are used to represent bitmasks with 'magic'  
numbers, like 32. i've changed these to a more representative bitshift  
representation, showing clearly in which bit you can expect this token  
to manifest. ie, converted things like:

from:            DEEP_COPY_STATESETS         = 8,
to:              DEEP_COPY_STATESETS         = 1<<3,

showing clearly that this isn't the _value_ 8, but the _bit_ 8. this  
is an old pattern i see (and like to promulgate) to make code a bit  
more readable and maintainable. three headers are included from the  
trunk:

  CopyOp, ReaderWriter, and GUIEventAdapter

thanks,
bob


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