make compiler flag ALLOW_TOOLHANDLE_NONCONSTNESS configurable
this will permit build to be easily configurable to turn on/off the ALLOW_TOOLHANDLE_NONCONSTNESS
compiler flag via a statement like
cmake -DATLAS_ALLOW_TOOLHANDLE_NONCONSTNESS=OFF
the default value does not change (ie. allow non-constness). For now....
Edited by Charles Leggett