Added property discounted_price to ServiceSubscription and Payments models
Restructired CHOICES as a dict of values

There is only TIME:epoch_now, for now
Removed survived print :)
Removed another survived print !
Added unicode to ServiceSubscription
Inverted columns in ServiceSubscriptionPayment ModelForm
Improved some transaltions and added new ones.

In admin interface too.
Added help text to customer fields, translation

Fields are : 'ssn','vat'
Arranged fields order in ServiceSubscriptionPayment ModelAdmin
Moved EMAIL settings from dist settings file to default settings file
Changed Payment action text
Inverted ServiceSubscription managers (for admin), changed algorithm to find insolutes
Default mail sender set in default_settings
Created PercentageDecimalForm field to manage decimal fields containing a percentage.
 Changed cancel action behaviour on ServiceSubscription admin
Translation of invoice models
Added default mail template for the insolutes
Mail and admin actions (read well)

Changed EMAIL_TEMPLATE from srtring to dict (for multiple templates).

Bug found in admin actions inserted from get_actions(): gives typeerror
"takes exactly 3 arguments (4 given)". Actions added allusers-wide,
superuser check done into any single action (actions will be visible
to any user, though ).
Overrided get_queryset() for ServiceSubscription: superuser sees all_objects,
 other users see objects.
Fixed some bugs on insolute mail production logic.

Added translation into the mail template.
Added check about ServiceSubscription deletion

on ServiceSubscriptionPayments ModelForm and Model save method