Db connection query failure params

[Chepheus]

Hello, sorry for my English
I need this params to display whats wrong was in query.

[svivian]

Thanks for the PR. Could you explain a little more what this is for? The $params variable is not being used in your PR.

[Chepheus]

It is need for more detailed logs if inserting was failed.
I create plugin for import array of data and I don't want to stop importing if one of element is broken (by default script stops).
I need this params to understand whats wrong with my data without deep debugging.

[Chepheus]

About $params - I override default function to function qa_page_db_fail_handler($type, $errno = null, $error = null, $query = null, array $params = null)

[Chepheus]

What do you think about this PR? =)