[O] patch for ob-sql.el: improve MySQL header formatting, and add db spec header vars

[Gary Oberbrunner]

Let me know if this would be better as a pull request.  This patch does three things:

 * add a header-row delimiter to the tables returned from mysql

 * adds new sql-specific header args for the database connection, and implements them for mysql

 * (minor) adds an edebug spec to org-babel-result-cond to allow edebugging through it

--
Gary

org-mode-sql.patch
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