better functionality in new-external new file form

[GeoffFroh]

currently does not work as desired. incomplete data at entry

Froh and phil will look at this later

ne-external new file form.txt

[GeoffFroh]

See: forms.files.NewExternalFileForm (https://github.com/densho/ddr-local/blob/master/ddrlocal/webui/forms/files.py#L35) for datafields:

class NewExternalFileForm(forms.Form):
    filename = forms.CharField(required=True, max_length=255)
    mimetype = forms.ChoiceField(choices=MIMETYPE_CHOICES, required=True)
    size = forms.CharField(required=True, max_length=255)
    sha1 = forms.CharField(required=True, max_length=255)
    md5 = forms.CharField(required=True, max_length=255)
    sha256 = forms.CharField(required=True, max_length=255)

Template is at: https://github.com/densho/ddr-local/blob/master/ddrlocal/webui/templates/webui/files/new-external.html

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Issues and notes:

• forms.files.MIMETYPE_CHOICES only contains text/html and video/mp4; need more expansive list (https://github.com/densho/ddr-local/blob/master/ddrlocal/webui/forms/files.py#L30)
• filename field needs better label and/or help_text; very unclear in the UI what this is
• the data attributes for the file label, sort order and urls are missing

[GeoffFroh]

Initial fix in 0218658ee1ad8f40f0deacbb3c5dfaff6a88c495