Clean old NetBeans comments

I did a mistake and forgot to delete the Netbeans header for all libPMacc files
- delete all Netbeans header

I forgot to add license to *.def files
- add license (GPL) to all *.def files in PIConGPU
- update comment in findAndDo: add *.def as file type

Compile test message: 
 ...........,_
 ........../.(|
 ..........\..\ 
 ........___\..\,. ~~~~~~
 .......(__)_)...\ 
 ......(__)__)|...|
 ......(__)__)|.__|
 .......(__)__)___/~~~~~~