Check_MK Werk 1537: Added transformation code for user dashboards created between 2014-08 and 2014-10

ID: 1537 Title: Added transformation code for user dashboards created between 2014-08 and 2014-10 Component: Multisite Level: 1 Class: Bug Fix Version: 1.2.5i7 Installations which were using early versions of the dashboard editor, which was first available our nightly builds from 2014-08 till 2014-10 and created dashoards with it, have now dashboards saved in a format, which can not be interpreted by the current dashboard code. For some time, we assumed that there were not many installations with such files, therefor we did not implement any migration code and asked the users to migrate by hand. But now we have a bit too many users which are having trouble here, so we decided to implement a migration routine for these dashboards.