Bugfixes in SVN rev 130

Misc bugfixes in rev 130:

fix -datadir with relative path
autostart is now off by default except on windows
fix occasional "vector iterator not dereferencable" assertion when compiled with msvc
fix readlink compile warning on linux build
use sys/param.h and BSD define instead of __BSD__
-paytxfee switch, e.g. -paytxfee=0.01

From what I understand a node will not include transactions in it's blocks unless the transaction includes a fee that meets the node's requirements. So in the case of a node setting the fee to 1,000 it would likely never include any transactions in blocks it generates, which means it will miss out on any transaction fees other nodes would have gotten. There really isn't a reason to set a nodes requirements higher then the rest of the network since you are basically just pricing yourself out of the market.