(sql-set-sqli-hook): A hook run when sql-buffer is

(sql-set-sqli-hook): A hook run when sql-buffer is
changed.  This is needed for master.el to work.
(sql-set-sqli-buffer): Use the new hook.

(sql-make-alternate-buffer-name): Function that sets
sql-alternate-buffer-name.
(sql-alternate-buffer-name): Possible name of SQLi buffers.
(sql-interactive-mode): Set sql-alternate-buffer-name.
(sql-rename-buffer): New command.
(sql-interactive-mode-menu): Menu for SQLi buffers.

(sql-interactive-mode): Doc fix.  sql-input-ring-separator
and sql-input-ring-file-name are used to temporarily set
comint-input-ring-file-name and comint-input-ring-separator when
reading and writing input history files.

(sql-stop): Use sql-input-ring-separator and
sql-input-ring-file-name.
(sql-input-ring-file-name): New variable with customization.
(sql-input-ring-separator): New variable with customization.
(sql-set-sqli-buffer): Renamed from sql-change-sqli-buffer.
Callers changed.
(sql-show-sqli-buffer): The message for "sql-buffer is not set"
now includes the name of the current buffer.

(sql-mode): Set paragraph-separate and paragraph-start so that
sql-send-paragraph sends the entire SQL statements, even if it
contains indented lines.