and
* enable 2 other optional cards
  HUBBARD, SOLVENTS

implement selection of the formats with the new_format attribute of
LDA+U. When passing the attribute the whole dftU dictionary is passed
as a single keyword argument.

allows to indicate the used schema from command line

Update formats

  - Bump minor version
  - Add tests for Python 3.11
  - Update dev requirements with tox>=4.0
  - Remove {homedir} from tox.ini
  - Replace whitelist_externals with allowlist_externals in tox.ini
  - Exclude Python 3.7 from flake8 CI tests (not compatible)

to use fetch schema the source must be passed to the constructor
otherwise a default schema is used instead of the one indicated
by the schemaLocation attribute