Merged the "accounting.database" module into the "accounting" module. It has only one member as "db", the database instance, and does not need to be separated into another file.

src/accounting/account/views.py

@@ -23,7 +23,7 @@ from flask import Blueprint, render_template, session, redirect, flash, \
     url_for, request
 from werkzeug.datastructures import ImmutableMultiDict
 
-from accounting.database import db
+from accounting import db
 from accounting.locale import lazy_gettext
 from accounting.models import Account, BaseAccount
 from accounting.utils.next_url import inherit_next, or_next