AmberTools26 data provenance for Xponge Lipid21

Source files:
  dat/leap/parm/lipid21.dat
  dat/leap/lib/lipid21.lib

The AmberTools LICENSE states:

  "The force field parameter files in the \"../dat/leap\" subdirectory have
   been placed in the public domain by their authors."

The generated lipid21.mol2 and lipid21_manifest.json retain the source file
SHA256 in the manifest. Xponge conversion metadata does not change the
scientific parameter values, atom names, atom types, charges, or connectivity.
