SQL Mode Version2.4 - Improved login prompting

SQL Mode Version2.4 - Improved login prompting

	* progmodes/sql.el: Version 2.4.  Improved Login prompting.
	(sql-login-params): New widget definition.
	(sql-oracle-login-params, sql-mysql-login-params)
	(sql-solid-login-params, sql-sybase-login-params)
	(sql-informix-login-params, sql-ingres-login-params)
	(sql-ms-login-params, sql-postgres-login-params)
	(sql-interbase-login-params, sql-db2-login-params)
	(sql-linter-login-params): Use it.
	(sql-sqlite-login-params): Use it; Define "database" parameter as
	a file name.
	(sql-sqlite-program): Change to "sqlite3"
	(sql-comint-sqlite): Make sure database name is complete.
	(sql-for-each-login): New function.
	(sql-connect, sql-save-connection): Use it.
	(sql-get-login-ext): New function.
	(sql-get-login): Use it.
	(sql-make-alternate-buffer-name): Handle :file parameters.