Add "xlrd" to "material" optional dependencies

Author: khaeru

message_ix_models/model/material/data_aluminum.py

@@ -804,6 +804,7 @@ def gen_hist_new_cap(s_info):
     dict
         Dictionary with 'historical_new_capacity' and 'fixed_new_capacity' DataFrames.
     """
+    # NB Because this is (older) .xls and not .xlsx, the 'xlrd' package is required
     df_cap = pd.read_excel(
         package_data_path(
             "material", "aluminum", "raw", "smelters-with 2022 projection.xls"

pyproject.toml

@@ -62,6 +62,7 @@ docs = [
   "sphinxcontrib-bibtex",
 ]
 iea-web = ["dask[dataframe]"]
+material = ["xlrd"]
 migrate = [
   "git-filter-repo",
   "GitPython",
@@ -70,7 +71,7 @@ report = ["plotnine", "xlsxwriter"]
 tests = [
   "ixmp[tests]",  # TODO Remove once message_ix[tests] depends on ixmp[tests]
   "message-ix[tests]",
-  "message_ix_models[report,transport]",
+  "message_ix_models[material,report,transport]",
   "pytest",
   "pytest-cov",
   "pytest-timeout",