big rework to comply to current spec

- adapt to release(v2018-11-07)
- remove duplicate errors.py
- adapt tests

Change-Id: I383bb571f9808c72b37c12fbe55042011c4c0084
Reviewed-on: https://forge.frm2.tum.de/review/19397
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>

etc/cryo.cfg

@@ -40,9 +40,9 @@ timeout=900
 pollinterval.export=False
 
 # some parameter grouping
-p.group='pid'
-i.group='pid'
-d.group='pid'
+p.group=pid
+i.group=pid
+d.group=pid
 
-value.unit='K'
+value.unit=K