Unable to upload CSV file on Grid import page

[Alexander Obuhovich]

Each grid can optionally have export/import buttons to export all data, that is matching a filter into a CSV file and later import it back.

This can be used for mass record editing in easy spreadsheet format.

However it turns out, that non-root users, who don't have access to "Tools -> System Tools" section can't upload any previously exported CSV file because of "No Permission" error.

Task: http://tracker.in-portal.org/view.php?id=1446

Ready for testing.

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