Release 5.1.1

Fixes

• fixes #136, #137 , #138, #139, #140
• fix error in mdf v4 RTABX conversion parsing
• merged #141 (thanks to @JulienGrv )
  • fix for CAN bus logging when CAN messages were not found in the attached database
  • fix for CAN bus logging when the attached database is not found (external attachment)

Changes

• related to #137
  • important speed and RAM improvements for the select method
  • added copy_master argument to select method