conc_entrate by wubwub

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Six jumps of increasing difficulty, ranging from advanced to
expert. The first two jumps use three concs each, and the 
remaining four use four concs each. The jumps were tested by
Monkey, Nerve, Son Goku and myself.

I have added demoman to this instead of quad_fj2 for what I 
hope will be obvious reasons, but I'm not sure if it's pipeable.

Good luck, and everything is possible. Don't give up too easily!

_r version: j6 fixed, no more wacky wall intrusions, and quad
actually added for demoman this time.

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23rd February 2010