Ensure that @check always clear error stack.

[lupemba]

References

This PR is created to solve issue #185. It should also help with issue #180

Description

I have tried to make a slightly more general fix. @check will now handle elements in XML_GLOBAL_ERROR_STACK also when the ccall completes as expected. These elements will be handled as warnings. This also allows us to remove the show_warnings from the html readers and just have it as a general part of @check. Positive side note is that 'EzXML' now can parse XMLs with invalid xmlns.

A test cases have been added to ensure that it solves the original issue.

[sjkelly]

Looks good to me! I think the @check macro is the robust location to do this.

[sjkelly]

Is this still needed after #143?

[sjkelly]

Also needs a rebase now

[lupemba]

Is this still needed after #143?

Not really,
The handling of warnings works for issue #185 now. I still think it would be more robust having the show_warnings in the check macro but it is way more difficult now with the new show_warnings options.