abstraction: roll forward/back

Dependencies

• [2] OI2U4SQ3 extract a function
• [3] T3LA4DVG new command: batch GET
• [4] OJLXS67N a prefix for metadata in the manifest
• [5] JIWWTY7R extract a function
• [6] TNRO6KLZ new live app

Change contents

• replacement in main.lua at line 244
  [3.6447]→[2.4:42](∅→∅),[2.42]→[3.6533:6577](∅→∅),[3.6533]→[3.6533:6577](∅→∅)
  − app.update_head(app.Next_version)

  − app.Next_version = app.Next_version + 1
  [3.6447]

  [3.6577]
  + app.roll_forward()
• replacement in main.lua at line 272
  [3.7132]→[2.43:81](∅→∅),[2.81]→[3.7218:7262](∅→∅),[3.7218]→[3.7218:7262](∅→∅)
  − app.update_head(app.Next_version)

  − app.Next_version = app.Next_version + 1
  [3.7132]

  [3.7262]
  + app.roll_forward()
• edit in main.lua at line 284
  [3.32]

  [3.32]
  + function app.roll_forward()

  + app.update_head(app.Next_version)

  + app.Next_version = app.Next_version + 1

  + end

  +