Change to libpgeasy connectdb() call

In working on my book, I have found another problem with libpgeasy.  It
uses the old-style PQsetdb() arg parameters, rather than the newer
opt=val PQconnectdb() parameters.

I have changed libpgeasy to use this new style.  This change will appear
in 7.0.1.  It is not optimal to do this in a minor release, but I have
to document it in my book, and it should be the new format so it can
accept username/password.

Also, I had changed the connectdb() parameters in 7.0, so everyone
should remember what to change.  :-)  I suspect it is not used by too
many people yet because it just make it out of /contrib in 7.0.

I considered allowing two connection functions for backward
compatibility, but connect() was the natural choice.

Sorry for any confusion this causes.  The change will be documented
in the 7.0.1 release notes.

--
  Bruce Momjian                        |  http://www.op.net/~candle
  pgman@candle.pha.pa.us               |  (610) 853-3000
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