WIP: Upload issues

This PR collects all commits related to upload issues #30 (closed), #18 (closed), and others

app/routes.py

@@ -104,18 +104,10 @@ def upload():
         session['rayt_names'] = rayt_names
         session['tree_names'] = tree_names
 
-        form.go.render_kw = {'enabled': 'enabled'}
-        return render_template(
-            'upload.html',
-            title="Upload sequences",
-            confirmation_form=form,
-        )
-
-    form.go.render_kw = {'disabled': 'disabled'}
     return render_template(
         'upload.html',
         title="Upload sequences",
-        confirmation_form=form,
+        confirmation_form=form
     )
 
 @app.route('/submit', methods=['GET', 'POST'])