Adapt_check

[Thomas C Hansen]

I'm not sure, but I think it's Adapt_check which makes my new simulation stop
without error messages after about 100 neutrons passed (sometimes with finite
weight p - due to the flux greater than 1 - also in Adapt_check). Debugging
won't be easy, but if you could file me some general hints for the use of
Source_adapt/Adapt_check, that may already be helpful enough.

Thanks a lot in advance,

Thomas