Actually add SQL files to the distribution.

Dependencies

• [2] P73KM42L Update the list of SQL files to be installed.
• [3] FV2M6MOT hydra: use autoconf/-make
• [4] AMFMXR52 Provide a command ‘hydra-init’ to initialise/upgrade the database
• [5] KN3VYE5P * Cleaned up the foreign key constraints.

Change contents

• replacement in src/sql/Makefile.am at line 2
  [3.4516]→[2.0:23](∅→∅)
  − nobase_sql_DATA = \
  [3.4516]

  [2.23]
  + nobase_dist_sql_DATA = \