Enable customisation of constraints

Author: dalonsoa

src/muse/constraints.py

@@ -225,7 +225,7 @@ def factory(
     """
     from functools import partial
 
-    if settings is None:
+    if not settings:
         settings = (
             "max_production",
             "max_capacity_expansion",

src/muse/data/example/default/settings.toml

@@ -59,7 +59,8 @@ constraints = [
     "max_production",
     "max_capacity_expansion",
     "demand",
-    "search_space"
+    "search_space",
+    "minimum_service"
 ]
 demand_share = "new_and_retro"  # Optional, default to new_and_retro
 forecast = 5  # Optional, defaults to 5

src/muse/data/example/default_timeslice/settings.toml

@@ -61,7 +61,8 @@ constraints = [
     "max_production",
     "max_capacity_expansion",
     "demand",
-    "search_space"
+    "search_space",
+    "minimum_service"
 ]
 demand_share = "new_and_retro"  # Optional, default to new_and_retro
 forecast = 5  # Optional, defaults to 5

src/muse/sectors/subsector.py

@@ -191,6 +191,7 @@ def factory(
             # only used by self-investing agents
             investment=getattr(settings, "lpsolver", "adhoc"),
             forecast=getattr(settings, "forecast", 5),
+            constraints=getattr(settings, "constraints", ()),
         )
         # technologies can have nans where a commodity
         # does not apply to a technology at all