uc_out_of_stock 6.x-1.6

Finally, a new release with a LOT of added features and fixes, please test and report.

- #732446: Making "out of stock" message a "multilingual variable" by fabio84,hanoii: Added Making 'out of stock" message a "multilingual variable".
- #1002702: Add ability to disable throbber by hanoii: Added Add ability to disable throbber.
- #652086: Hide the quantity field too: Added Hide the quantity field too.
- Removing t() from the actual HTML setting
- #657924: Option to disable the use of Javascript by 20th, PieterDC, hanoii: Added Option to disable the use of Javascript.
- #559008: Customising/Overriding the _uc_out_of_stock_get_error() function by PieterDC | McBastard: Added Customising/Overriding the _uc_out_of_stock_get_error() function.
- #1276436: Make form errors consistent by PieterDC, hanoii: Fixed Make form errors consistent.
- #957142: Out of Stock Message Can be Added Multiple Times by jrust, hanoii: Fixed Out of Stock Message Can be Added Multiple Times.
- #514170: Make the module less process consuming by jrust, hanoii, djflux | Vuds: Added Make the module less process consuming.