made set_value not eval when there are too many nodes
made LOTHypothesis.set_value not eval when value has too many nodse
added signal handler to sig 24, CPU time exceeded
fixed primitives; removed lot_iter from inference
cleaned up and revised enumeration, renamed enumeration
extracted a new function for lazy itertools.product
added EnumerationInference
fixed to match grammar.enumerate changes
added ParticleSwarm
fixed deviant if statement; renamed "resample" to "refresh"
moved schemestring to a separate function, updated
fixes to handling of IndexErrors
made lambdas explicit in str(Hypothesis)
made lambdas explicit
Many updates!