[purge.c] defined as a macro the (bw)cost used in the pruning; it seems that 	  optimizing the number of rows is better with the current bw code.
[purge.c] defined as a macro the (bw)cost used in the pruning; it seems that
	  optimizing the number of rows is better with the current bw code.


git-svn-id: 189946a10c5fc96e9dd03ba7cba917cd4c3d09f4@1787 de4796e2-0b1e-0410-91b4-86bc23549317

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs