Move resize on upload to base method ArtefactTypeFile::sav e_uploaded_file

[Alan McNatty]

Bug #717184 implements a very cool new feature whereby images can be automatically resized on upload (if the user enables the config setting).

This functionality has been implemented in the view and not the model. That is the resize is performed in the function pieform_element_filebrowser_upload) and not in the base file artefact class (i.e. ArtefactTypeFile::save_uploaded_file method).

If a user has enabled image resizing then ArtefactTypeFile::save_uploaded_file should resize the image on save automatically. The biggest culprit to uploading oversized images may be mobile devices (as the mobile user often lacks the control to resize the content on the device)

It woul dbe great to move the resize functionality to the ArtefactTypeFile::save_uploaded_file method.