Removed global EventEmitter. Added local EventEmitter to Object really needing it. Alert.js now uses EventEmitter.

 * 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.

Do not address namespace with `QfqNS` in Object definitions. Instead, use `n`. This might have screwed up the code. We'll fix as we go along.

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.

On submit succes, if we don't navigate away from page, apply possible form updates, as received from the server.

QfqForm.js: Form refresh is now known as form update. Form updates receive more elaborate response from server.

Refactored Element.js, i.e. deleted it, since it has been degenerated to a proxy object, with no added value.

Added QfqNS.Element.getElement() function. Elements can now be set readonly/disabled. Renamed QfqNS.Element.Input to QfqNS.Element.Text.

Delete Button: When user confirms deletion of record, all buttons will be disabled and form removed.

BuildFormBootstrap: fixed typo in class id pills
QfqForm.js: rewrote logic after press 'save'