[PATCH] erc-bbdb usability fix.

Hi all, I suppose I must be one of the very few using BBDB with erc, because by default the erc-bbdb package exhibits a veryu annoying behavior I find hard to believe people like: * When showing the BBDB popup, the BBDB buffer is electric which means that it captures the keyboard "focus" and basically prevents updates to the channel buffer. * Specially annoying when a lot of the people in the channel are known to you and you are joining. The patch adds a customize option to control this behavior (I think off is the right default, but feel free to put it as t for backwards compatibility.) With erc-bbdb-electric-p set to nil, the bbdb buffer is no longer electric and it does not block progress. Thanks, Nelson -- Nelson Ferreira