Add comments explaining host defaults and password handling
Add comments explaining host defaults and password handling

nosun/pgcli,d33tah/pgcli,dbcli/vcli,TamasNo1/pgcli,j-bennet/pgcli,n-someya/pgcli,bitemyapp/pgcli,d33tah/pgcli,dbcli/vcli,bitmonk/pgcli,j-bennet/pgcli,suzukaze/pgcli,nosun/pgcli,w4ngyi/pgcli,janusnic/pgcli,MattOates/pgcli,joewalnes/pgcli,w4ngyi/pgcli,johshoff/pgcli,koljonen/pgcli,lk1ngaa7/pgcli,suzukaze/pgcli,koljonen/pgcli,lk1ngaa7/pgcli,MattOates/pgcli,darikg/pgcli,bitemyapp/pgcli,TamasNo1/pgcli,yx91490/pgcli,thedrow/pgcli,darikg/pgcli,zhiyuanshi/pgcli,dbcli/pgcli,zhiyuanshi/pgcli,johshoff/pgcli,n-someya/pgcli,yx91490/pgcli,dbcli/pgcli,joewalnes/pgcli,janusnic/pgcli,thedrow/pgcli,bitmonk/pgcli