* richcarl/mnesia/table_info_order:
  Preserve key order in mnesia:table_info

Helps when mnesia_tm gets drowned in dirty_writes from remote node.

* dgud/mnesia/fix-blocked/OTP-13970:
  Avoid some error reports when stopping mnesia
  mnesia: Fix double blocked tables which could cause a crash

Worker processes can cause error reports if the main mnesia processes
dissapear.

Fast restarts could cause table to be blocked twice.

A continuation returned by mnesia:select/[14] should be reusable in
different, non-transactional activities. Aborting with
wrong_transaction doesn't make sense in a dirty context.

When building match result patterns the tuples they must qouted
with { }, which causes a problem with variable patterns.

Use element(1, Match) instead of trying to build the two tuple.

* dgud/mnesia/ext-backend/PR-858/OTP-13058:
  mnesia_ext: Add basic backend extension tests
  mnesia_ext: reuse snmp field for ext updates
  mnesia_ext: Create table/data containers from mnesia monitor not temporary processes
  mnesia_ext: Implement ext copies index
  mnesia_ext: Load table ext
  mnesia_ext: Dumper and schema changes
  mnesia_ext: Refactor mnesia_schema.erl
  mnesia_ext: Ext support in fragmented tables
  mnesia_ext: Backup handling
  mnesia_ext: Create schema functionality
  mnesia_ext: Add ext copies and db_fold to low level api
  mnesia_ext: Refactor record_validation code
  mnesia_ext: Add create_external and increase protocol version to monitor
  mnesia_ext: Add ext copies to records
  mnesia_ext: Add supervisor and behaviour modules

Minimal impact when talking to older nodes.