* use anonymous functions for ajax error displays
 * expect response from server to file upload to have `status` and `message` attributes
 * replaced occurrences of `QfqNS` by `n` in order to support different namespace names.

qfq-bs.css.less: Tweaked less. Added new class for spinner. Changed display type of input[type=file].
FileUpload.js: every callback will be called with the originating file input element as first parameter.
QfqForm.js: Add spinner on upload.

BSTabs.js, PageState.js, Form.js: done.
Alert.js: first draw, layout not of alerts not proper yet.
Added jasmine tests.