only annouce GeneratedPathRefs if nonzero number of them
cpu versions work
added boolean and enum parameters
added boolean and enum parameters
Added int and enum array parameters.
Make file extensions be static class vars
Bind .to_dot() method to ast.AST subclasses.

This means you can use 'node.to_dot()' instead of 'to_dot(node)'
fix bug where _to_dot and to_dot were doing the same thing
Remove parent pointers b/c we couldn't set them consistently and automatically
got basic scheduler thing working
avoid redundant vector copies
added tip about cleaning the temp directory
fix dotgen system to use node.label()
Make LazySpecFunc.tranform return a ConcreteSpecFunc for greater versatility
Rewrite OclDoubler to use new interaction pattern with ctree.jit
got c/py pycl coordination working
prefix all cl constructs with cl.
update tests and examples for new jit workflow
store all temp files under ctree directory
cleanup and enable OclDoubler as test