[account_budget] When computing theorical amount one (1) day is missing from elapsed days and total days

On runbot

http://7-0-30413.runbot.openerp.com/?db=7-0-30413-all&ts=1392313676667#id=4&view_type=form&model=crossovered.budget&action=603

Date of computation: 02/13/2014

Create a Budget: Budget 2014
from: 01/01/2014
to: 12/31/2014

Budget Lines:
Analytic Account | Budgetary Position | Start Date | End Date | Paid Date |Planned Amount | Practical Amount | Theoretical Amount | Percentage
Seagate P1 | Purchases | 02/01/2014 | 02/28/2014 | False | 28000.00 | 0.00 | >> 12444.44 << | 0.00

Theorical Amount : 12444.44

This value is wrong
[7.0] http://bazaar.launchpad.net/~openerp/openobject-addons/7.0/view/head:/account_budget/account_budget.py#L167
[trnk] http://bazaar.launchpad.net/~openerp/openobject-addons/trunk/view/head:/account_budget/account_budget.py#L165

These lines say:

theo_amt = float(elapsed.days / float(total.days)) * line.planned_amount

theo_amt = float( (02/13/2014 - 02/01/2014).days / float( ( 02/28/2014 - 02/01/2014).days )) * 28000

theo_amt = float( 12 / float( 27 )) * 28000

theo_amt = 12444.44

This should be like this:

theo_amt = float(( elapsed.days + 1) / float(total.days + 1)) * line.planned_amount

theo_amt = float( ((02/13/2014 - 02/01/2014).days + 1)/ float( ( 02/28/2014 - 02/01/2014).days + 1)) * 28000

theo_amt = float( 13 / float( 28 )) * 28000

theo_amt = 13000.00

Best Regards.