Fix AI director spawning aliens inside walls

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Further description of the enhancement:

Summary explains it all. Give the aliens a bigger buffer when the AI director 
is checking if they'll fit in the space available.

Is this enhancement being created to fix another bug?:

Yes.

If so, what issue?:

AI director will sometimes spawn boomers and parasites so close to a wall that 
they'll get stuck.

Original issue reported on code.google.com by ibe...@gmail.com on 13 Oct 2011 at 4:14

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Original comment by ibe...@gmail.com on 13 Oct 2011 at 4:18

• Added labels: Type-Defect
• Removed labels: Type-Enhancement

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Original comment by ibe...@gmail.com on 29 Oct 2011 at 8:00

• Changed state: Started

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Hooray! Issue fixed in r308

Original comment by ibe...@gmail.com on 30 Oct 2011 at 2:50

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Original comment by ibe...@gmail.com on 30 Oct 2011 at 5:32

• Changed state: Done