* Added an alternative "simpler" bunch type BaseBunch, supporting only iteration and __repr__ as special features.
 * Made bunchMergedDeepCopy available on the pyson module level, to provide this feature for BaseBunch
 * Renamed namedPysonBunchRepr to namedBunchRepr
 * Consequentially refactored and improved the code a bit

(Tested in python 2.7 and 3.3 by using it in an application based on PySON.)