Version 1.5.1 - Bugfix release

Version 1.5.1 of Zooom has been released, and contains the following bug fixes:

- Several memory leaks have been plugged. Lots of memory would be used if the preferences were changed very very often.

- New users often had problems with Zooom appearing not to run at all when it was first installed - this has now (hopefully) been corrected. It was a hard one to test for, so if this problem still occurs - please do let me know.

- Product price adjustment.