PGS: Replace PQsetdbLogin with PQconnectdb

[mtangoo]

PQconnectdb Makes a new connection to the database server. PGconn PQconnectdb(const char conninfo);

This function opens a new database connection using the parameters taken from the string conninfo. The passed string can be empty to use all default parameters, or it can contain one or more parameter settings separated by whitespace, or it can contain a URI. See Section 31.1.1 for details. PQsetdbLogin Makes a new connection to the database server.

PGconn *PQsetdbLogin(const char *pghost,
                     const char *pgport,
                     const char *pgoptions,
                     const char *pgtty,
                     const char *dbName,
                     const char *login,
                     const char *pwd);

This is the predecessor of PQconnectdb with a fixed set of parameters. It has the same functionality except that the missing parameters will always take on default values. Write NULL or an empty string for any one of the fixed parameters that is to be defaulted. If the dbName contains an = sign or has a valid connection URI prefix, it is taken as a conninfo string in exactly the same way as if it had been passed to PQconnectdb, and the remaining parameters are then applied as specified for PQconnectdbParams.

[mtangoo]

Old function works fine with no performance or functional issues