Merged the "accounting.base_account.models" and "accounting.account.models" modules into the new "accounting.modules" module, so that the data models can reference one another.

src/accounting/account/commands.py

@@ -25,8 +25,7 @@ import click
 from flask.cli import with_appcontext
 
 from accounting.database import db, user_utils
-from .models import Account, AccountL10n
-from ..base_account import BaseAccount
+from accounting.models import BaseAccount, Account, AccountL10n
 
 AccountData = tuple[int, str, int, str, str, str, bool]
 """The format of the account data, as a list of (ID, base account code, number,