Fix/check same verbosity

@PeterMuehlfellner This fixes #45 

I added an option to switch the verbosity on and off, with off being the default as you suggested. If you want the verbosity you can simply switch it globally on and off depending on your needs:
```  
ComplexEntry e1, e2;
e1.setRandom();
e2.setRandom();
SET_CHECKSAME_SILENT;
ASSERT_FALSE(SM_CHECKSAME(e1, e2));

e2 = e1;

SET_CHECKSAME_VERBOSE;
ASSERT_TRUE(SM_CHECKSAME(e1, e2));
```
**Note:** Since verbosity is a global setting it is not threadsafe, e.g. if your tests run in parallel, you might get some artifacts.