Keep track of the data on the financial situation of a Cooperator

[SergioArbarviro]

The situation of a Cooperator vis-à-vis its financial duties to the Cooperative deserve being tracked.

This situation consists of:

• the number of shares that the Cooperator owns (so as to keep track that s/he owns the minimum number of shares to be a Cooperator, namely 1 share, and so that these shares can be paid back, if needed, at the end of the presence of the Cooperator in the Cooperative);
• the date at which the current yearly contribution to the Cooperative of the Cooperator reaches its end of validity, so as to know when s/he needs to pay his/her contribution again (this date is by default set at a date in the past upon initialisation of the account).

I thus suggest to add the following variables to the LDAP directory:

• numberSharesOwned: integer, default value = 0;
• dateEndValidityYearlyContribution: date, default value = 01-Jan-2020.

The default values should be managed by AlirPunkto.

These values will be updated by the online commercial site via a Python script, and enable an automated management of the groups described in Issue #74, as per the management described in Issue #76.

[SergioArbarviro]

Added that the default values of the variables are managed by AlirPunkto.