It seemed trivial enough, so I updated all systems (makefiles, xcode, scons, scons win installer), please complain if something went wrong. Mostly it was just removing release/bpydata references, since the release/scripts dir is already worked on recursevely, handling dirs inside it.
For the scons nsi file writer script I had to write code for each new dir, but it can be recoded recursively, too (in fact joining all release stuff in a single dir tree with nothing else would be a good idea, making installation code simpler). Since it's just python and I have a little more time now, I can help scons managers if they still need.
Thanks Campbell Barton for reporting.
This installer script is modified from the original one so that the SConstruct
will dynamically add the files that need to go into the installer. This means
that adding a script to release/scripts will automatically put it in the installer.
Also, adding new resource files in bin/.blender/ will make sure that those get
added to the installer.