recompile swig files if the swig version changes
have distclean remove the waf cache on windows
Missing folders for Issue 1325
Issue 1372 version detection for old and buggy sun compilers
missing change
Issue 1377
handle empty defines when pasting tokens
Issue 1379, nasm trailing slashes
qt5 tool
Issue 1382, hash randomization on python 3.3 causes reconfigurations
Issue 1384 - pickle changes in Python 3.4
Memory usage reducer, based on a post to the mailing-list by Christian Nilsendahl
removed the set copy to enable faster iterations
shrinking sets for the memory reducer
another optimization spot for the shrinking sets system