Add missing upgrade-*.sql files

Dependencies

• [2] P73KM42L Update the list of SQL files to be installed.
• [3] EHEJZ6YV Actually add SQL files to the distribution.
• [4] KN3VYE5P * Cleaned up the foreign key constraints.

Change contents

• replacement in src/sql/Makefile.am at line 7
  [2.110]→[2.110:170](∅→∅)
  − upgrade-2.sql \

  − upgrade-3.sql \

  − upgrade-4.sql
  [2.110]

  [3.3453]
  + upgrade-*.sql