Unstable relese 0.7.15 available.

I have uploaded version 0.7.15 to the unstable project.

It mostly has small fixes, but has some work that Tristan and I have done to try to make using libaqsis to build and run simple examples out of the Renderman Companion easier.

Also included is Anteru's soft shadow support, (still not right, as there are some bugs in the shadow sampling in general), and Tim's framebuffer save work.

Have fun.