Improve unit testing feedback

### Description

Improve unit testing feedback

### How to test

Run...

```matlab
[UnitTests,UnitTestsTable] = xASL_test_UnitTesting(bPull)
```

... with and without a `Testing` repository in the same directory and run ...

```matlab
x = ExploreASL;
```

... and check out the new version statement.

### Release note

Improve user feedback for unit testing and initialization.

