with the new operators '<+' and '+>' respectively. '<<' and '>>' are now used only for left and right binary shit respectively. Further, their priority has been increased moving them to a higher priority than that of the assignment operator.
Also, fixed and improved some parsing sections concerning collection indeces and ranges
the previous flags allowForest and allowVarRef. Added binary operator (work in progress). Better implementation of +=,-=,*=, and /= (new) operators.
