7.0 add account reconciliation reopen

This module allows to reopen reconciliations by creating an additional journal
entry and unreconciling the existing journal items.

See the following example

**Confirmed invoice**


 N  |  Account |  DR |    CR
--- | -----------| ------| -----
 1A |  Debtors |  1000 |
 1B |  Sales |          | 1000

**Paid invoice**

 N  |  Account |  DR |    CR
--- | -----------| ------| -----
 2A |  Bank |     1000 |
 2B |  Debtors |        | 1000

*1A* and *2B* are reconciled by *A1*

**Reopening**

For example, the bank takes back the money. You have to reopen the credit.

So, you can select the *1A* journal item and run the *reopen reconciliation*
wizard.

The module generates the following entry

 N  |  Account |  DR |    CR
--- | -----------| ------| -----
 3A |  Debtors |  1000 |
 3B |  Bank |           | 1000

The module cancels the *A1* reconciliation and create a new one between
*2B* and *3A*