Update .checkstyle_checks.xml from SOMns
Update .checkstyle_checks.xml from SOMns

Checkstyle changed its config format somewhat.
This is basically a copy from SOMns. Style is not change with intention.

Signed-off-by: Stefan Marr <46f1a0bd5592a2f9244ca321b129902a06b53e03@stefan-marr.de>

SOM-st/black-diamonds,SOM-st/black-diamonds