Support for resolv.conf search and ndots

I adapted Florin Andrei's patch for support of the search directive in
/etc/resolv.conf and added support for ndots resolution as well (since
having one and not the other can seriously break name resolution).

I was hoping to get this integrated, because the search path stuff has
been put off for a long time now, and the ndots is a critical
component of name resolution through resolv.conf

Thien