Bugfix - truncated templates

This release fixes a serious bug related to saving XML and List templates. Due to MySQL limitations, templates were truncated during save operation if its size exceeded 64k, resulting in irreparable data corruption. After the fix templates can have up to 16M.

Following minor bugs were also fixed:

• bug in productPrice function regarding input parameter validation
• fix sql generation for Has many and belongs to relationships

Note: This release changes database structure of DataKick tables.