errors highlighter: syntastic#HighlightErrors() third optional bool argument to force callback call
errors highlighter: syntastic#HighlightErrors() third optional bool argument to force callback call

Normally if location item has "col" item, syntastic#HighlightErrors() handle it without callback
call for performance reason. But sometimes it's necessary to handle all items with callback
(like in new vala syntax checker), so third optional bool arg is added to the function.

If this argument exists and has true value, then callback function is called on *all*
location items, no matter is they have "col" element or not.

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