[cs] misc cleanups

[Mike Stump]

I've added some small cleanups to the compile server.  Fortran and Java 
are closer to building again, we free up some more memory, handle 
resetting the effects of #assert, default load balancer to on for C++ 
and off for C and make currently_nested < 0 the same as 
currently_nested == 0.

Tested with recompile-with-server.

Finder_FE builds are currently broken, Per, I think your recent changes 
broke it.  Looks like -D processing, PCH validation and cpp resetting 
might be at fault.  :-(

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