Bug 13320: Move price calculation from tt to pl

Bug 13320: Move price calculation from tt to pl

In parcel.tt, total are calculated for subtotal.

This could be done in the pl script for more consistency.

Test plan:
Go on a parcel page with several already received orders.
Orders must be linked to different funds.
If possible ecost and unitprice (price on ordering and on receiving)
should changed (different values will be displayed in the table).

The values displayed before and after the patch must be the same.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>