Fix __all__ in api to include all required function to be exported in *

Author: comcon1

src/fairmd/lipids/api.py

@@ -47,8 +47,10 @@
     "get_ApL_data",
     "get_FF",
     "get_OP",
+    "get_density",
     "get_eqtimes",
     "get_mean_ApL",
+    "get_quality",
     "get_thickness",
     "get_total_area",
     "mda_gen_selection_mols",