Improve single, multiple document and document versions downloads

By using a 2 step document download view

apps/documents/forms.py

@@ -312,3 +312,16 @@ class DocumentTypeFilenameForm_create(forms.ModelForm):
     class Meta:
         model = DocumentTypeFilename
         fields = ('filename',)
+
+        
+class DocumentDownloadForm(forms.Form):
+    compressed = forms.BooleanField(label=_(u'Compress'), required=False, help_text=_(u'Download the document in the original format or in a compressed manner.  This option is selectable only when downloading one document, for multiple documents, the bundle will always be downloads as a compressed file.'))
+        
+    def __init__(self, *args, **kwargs):
+        self.document_versions = kwargs.pop('document_versions', None)
+        super(DocumentDownloadForm, self).__init__(*args, **kwargs)
+        if len(self.document_versions) > 1:
+            self.fields['compressed'].initial = True
+            self.fields['compressed'].widget.attrs.update({'disabled': True})   
+    
+