lemonpos 0.7 release

Lemonpos 0.7 has been released. There are new features and fixes.

LEMON
These are the new features included in the release:
- Added feature: one more filter to product grid filters: most sold products [by Biel Frontera]
- Added feature: Reprint Ticket [Adapted from Biel Frontera code ]
- Added feature: Change sale date (to register old sales that were not registered before) [Adapted from Biel Frontera code ].
- Added feature: Cash-Out. To take out money for payments at the POS.
- Added Feature: Now lemon does not quit if not connected to mysql, a config dialog for database is shown.
- Added Feature: A low level cash in drawer alarm. A config option for showing the alert and minimum value.
- Added Icons: cash-out, re-print ticket, balance.

SQUEEZE:
- Added Feature: New report for cash-outs.
- Added Feature: New field in the offers editor to allow calculation of offer-percentage with the price entered
So now offers can be calculated with price or percentage [by Biel Frontera]
- Added Feature: Now squeeze does not quit if not connected to mysql, a config dialog for database is shown.