Suppress continuation prompts in SQL interactive mode
* progmodes/sql.el: Version 2.5
(sql-product-alist): Add :prompt-cont-regexp property for several
database products.
(sql-prompt-cont-regexp): New variable.
(sql-output-newline-count, sql-output-by-send): New
variables. Record number of newlines in input text.
(sql-send-string): Handle multiple filters and count newlines.
(sql-send-magic-terminator): Count terminator newline.
(sql-interactive-remove-continuation-prompt): Filters output to
remove continuation prompts; one for each newline.
(sql-interactive-mode): Set up new variables, prompt regexp and
output filter.
(sql-mode-sqlite-font-lock-keywords): Correct some keywords.
(sql-make-alternate-buffer-name): Correct buffer name in edge
cases.