Pull request #1: Bugfix/VECTO-1481 new warning message regarding transmission what does it mean

Merge in VECTO/mk_vecto-dev from bugfix/VECTO-1481-new-warning-message-regarding-transmission-what-does-it-mean to develop

* commit 'ebb163db':
  Changed all string.Join by the new Extension Method Join()
  refactored and checked many Log-Messages with "Header Line is not valid"
  refactored Extension Method JoinString to Join
  corrected parameters for Log Message (Transmission Loss Map is not valid, VECTO-1481)
  Added new extension method for joining an Enumerable<T> with string.Join