Invoices admin section improvements

• When a pending invoice is cancelled new charges have to be created in order to restore the user balance.
• When a cancelled invoice is set as pending again some charges have to be deleted in order to restore the use balance.

Improve update_accounts_delinquent_status command logs

1.7.13

Improve update_accounts_delinquent_status command logs

Add type event log filter in admin site

1.7.12

Update version

Update delinquent flag default value

1.7.11

Update to version 1.7.11

Solvent accounts rev

1.7.10

Update version to 1.7.10

Solvent accounts

1.7.9

Update version

1.7.8: Account has_usable_credit_cards method (#9)

* Account has_usable_credit_cards method

* Update version

EventLog model admin improvements

1.7.7

Improve EventLog admin site and update version to 1.7.7

Debt paid signal

1.7.6

Update version to 1.7.6

Improve commands feedback

1.7.5

Update version to 1.7.5