idgames_db_dump.ini: issue #101; fixed typo in 'files' table

- updated checksums
db_tool: unlink db file with --create-db and --overwrite
Database: close #101; rearrange schema blocks when running blocks

- Reading a database schema from an *.ini file into a hash will cause the
  schema blocks to change their order (hash keys are random by default).
  Since the schema blocks are no longer sequentially numbered, the 'schema'
  block should always be placed first in the list of blocks to process,
  if it even exists in the list of blocks