Merge branches 'issue_82', 'issue_93', 'issue_98' and 'issue_99' into financial
issue_83: select recuring expense
issue_83: load expense categories
issue_82: fix delete and edit url for recurring_payment
issue_82: fix typo
issue_83: list and create recurring expenses
issue_83: recurring expense class
issue_98: handle delete income
issue_83: fix edit recurring payment, simplify creation of payment