two bugfixes

Dependencies

• [2] FQURPLDA new primitives for reading/writing files
• [3] HKV72RZV bugfix: save modified files in save directory
• [4] ED4Z6ORC cleaner API for file-system access
• [*] 3QNOKBFM beginnings of a test harness

Change contents

• replacement in app.lua at line 447
  [2.246]→[2.246:259](∅→∅)
  − App.read =
  [2.246]

  [2.259]
  + App.read_file =
• replacement in app.lua at line 470
  [3.16494]→[2.604:618](∅→∅)
  − App.write =
  [3.16494]

  [2.618]
  + App.write_file =
• edit in app.lua at line 481
  [2.959]

  [2.959]
  + return --[[status]] true