SQL Mode, Version 2.8 - sql-list-all and sql-list-table functions.

SQL Mode, Version 2.8 - sql-list-all and sql-list-table functions.

	* progmodes/sql.el: Version 2.8
	(sql-login-params): Updated widget structure; changes still
	needed.
	(sql-product-alist): Add :list-all and :list-table features for
	SQLite, Postgres and MySQL products.
	(sql-redirect): Handle default value.
	(sql-execute, sql-execute-feature): New functions.
	(sql-read-table-name): New function.
	(sql-list-all, sql-list-table): New functions. User API
	(sql-mode-map, sql-interactive-mode-map): Add key definitions
	for above functions.
	(sql-mode-menu, sql-interactive-mode-menu): Add menu definitions
	for above functions.
	(sql-postgres-login-params): Add user and database defaults.
	(sql-buffer-live-p): Bug fix.
	(sql-product-history); New variable.
	(sql-read-product): New function. Use it.
	(sql-set-product, sql-product-interactive): Use it.
	(sql-connection-history): New variable.
	(sql-read-connection): New function. Use it.
	(sql-connect): New function.
	(sql-for-each-login): Redesign function interface.
	(sql-make-alternate-buffer-name, sql-save-connection): Use it.
	(sql-get-login-ext, sql-get-login): Use it. Handle default values.
	(sql-comint): Check for program. Existing live buffer.
	(sql-comint-postgres): Add port parameter.