Merge branch 'develop' of github.com:ampl/mp into HEAD

support/modelexplore/.streamlit/config.toml

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+[server]
+enableXsrfProtection = false
+enableCORS = false
+

support/modelexplore/modelexplore.py

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+
+import streamlit as st
+
+# To work in st 1.30.1, see
+# https://discuss.streamlit.io/t/axioserror-request-failed-with-status-code-403/38112/13
+input_file = st.file_uploader("Model file (JSONL)")
+
+left_column, right_column = st.columns(2)
+
+# You can use a column just like st.sidebar:
+srch = left_column.text_input('Search pattern:')
+
+# Or even better, call Streamlit functions inside a "with" block:
+fwd = right_column.checkbox('Add descendants', disabled=True)
+bwd = right_column.checkbox('Add ancestors', disabled=True)
+
+if input_file is not None:
+  with left_column:
+    bytes_data = input_file.read()
+    st.write("NL model")
+    st.write(bytes_data)
+  with right_column:
+    st.write("Flat model")
+else:
+  with left_column:
+    st.write("No file selected.")