made a compilable version of what was beta4.4 before

--HG--
branch : beta4-rc

transplanted changeset 4005:1d54f49ff666

--HG--
branch : beta4-rc

fixed bug #26638

--HG--
branch : beta4-rc

fixed 2 crash bugs in the editor

--HG--
branch : beta4-rc

tutorial 3 corrupted, now changed.

--HG--
branch : beta4-rc

Fixed bug introduced by earlier changes to Building and Unit

--HG--
branch : beta4-rc

Made change to beta3 branch so that it compiles

--HG--
branch : beta3-rc

Merged

--HG--
branch : beta2-rc

making some fixes for scons builds

--HG--
branch : beta1-rc

alpha 23 debian tag