Merge branch 'rmch'

Merge branch 'rmch'

* rmch:
  maint: simplify generation of files with @substed@ stuff
  t/README: update w.r.t. recent overhaul (non-recursive build system)
  docs: fix names of relevant test cases in comments
  NEWS: automake build systems avoids make recursion
  maint: no more make recursion in Automake's build system
  tests: rename 'tests/' => 't/', '*.test' => '*.sh'
  tests: remove recipes that run tests with 'prove'
  tests: move most helper scripts and files into the 'ax' subdirectory