Moved ModelItem_TEST to standalone test
Added fatal error in CMakesLists when missing dataset
Merge of tests UnitClasses and UnitIDs into standalone/UnitsIDsClasses_TEST
Adding new tools test

* Added in OpenFLUIDConfig custom check, load and clear function on simulation config
* Updated test of Dataset with new tools
Updated save/open functions and tests

* Added in saveDataset the creation of output directory
* Moved OpenProject_TEST into Project_TEST
* Added in Project_TEST test on save project function
* Changed beginning value for begin and end date to current day