Merge branch 'next'

# By Ruediger Meier (12) and Sebastian Freundt (1)
# Via Sebastian Freundt (2) and Ruediger Meier (1)
* next:
  tests, hack copying non-writable files fails (make distcheck)
  tests, test suite is running in parallel again
  tests, don't use useless option --hash
  tests, add clean rule for local tempdirs
  tests, remove more mktemp calls
  tests, don't use mktemp to create CMDFILE
  tests, fix renamed TS_EXP_STDOUT variable
  tests, fix renamed OUTFILE variables
  tests, fix renamed TS_EXP_EXIT_CODE variable
  tests, fix REFFILE path
  test suite, re-add missing features
  test suite, copy over improved test suite from atem
  chore, add README.md to dist