I have created  working salary section

There is Template superclass model and two inherited classes
Pitemplate and Petemplate. Each has its own functions
to calculate and update salary.

There is a Salary model which will save all the data about
salarie. Acountant can create and upadte the salaries for
all users with one button click.

He can see all the salaries foe all users and filter the
information by a Name or a Lastname of user or by period

He can create only one set of salaries for one period.
When he tryes to create salary for a user it looks into
user.profile and coose the template acoording to users
employment type (PE or PI). Template make calculation and
Salary stores calculated values.

Accountant can add some amount to the salary as an
aditional_fees and comment the reason.

All the information about salaries is shown on the
'salaries/all' page

Change-Id: I10bc152d51a2681e0e2c68a9229142334c63b339