flatten isect and union nodes to simplify ASTs
flatten isect and union nodes to simplify ASTs

dipinhora/ponyc,malthe/ponyc,Theodus/ponyc,Perelandric/ponyc,Praetonus/ponyc,ponylang/ponyc,dipinhora/ponyc,jupvfranco/ponyc,boemmels/ponyc,jupvfranco/ponyc,CausalityLtd/ponyc,kulibali/ponyc,ponylang/ponyc,sgebbie/ponyc,lukecheeseman/ponyta,Perelandric/ponyc,dipinhora/ponyc,mkfifo/ponyc,CausalityLtd/ponyc,boemmels/ponyc,jupvfranco/ponyc,mkfifo/ponyc,cquinn/ponyc,malthe/ponyc,Theodus/ponyc,Theodus/ponyc,kulibali/ponyc,sgebbie/ponyc,Theodus/ponyc,ponylang/ponyc,Perelandric/ponyc,cquinn/ponyc,sgebbie/ponyc,jemc/ponyc,sgebbie/ponyc,boemmels/ponyc,jemc/ponyc,malthe/ponyc,Perelandric/ponyc,ryanai3/ponyc,boemmels/ponyc,doublec/ponyc,Praetonus/ponyc,sgebbie/ponyc,lukecheeseman/ponyta,doublec/ponyc,ryanai3/ponyc,doublec/ponyc,kulibali/ponyc,jupvfranco/ponyc,cquinn/ponyc,CausalityLtd/ponyc,mkfifo/ponyc,lukecheeseman/ponyta,Theodus/ponyc,Praetonus/ponyc,malthe/ponyc,jemc/ponyc,kulibali/ponyc,mkfifo/ponyc,Praetonus/ponyc,Perelandric/ponyc,cquinn/ponyc,mkfifo/ponyc,boemmels/ponyc,jupvfranco/ponyc,ryanai3/ponyc