[geary] (10 commits) ...Merge branch 'mjog/db-result-timing' into 'mainline'

[Michael Gratton <mjog src gnome org>]

Summary of changes:

  3b6dd30... Geary.Db.Context: Update access to DatabaseConnections (*)
  a1d3184... Geary.Db.Result: Log large elapsed query times as a warning (*)
  485868d... Geary.Db.DatabaseConnection: Check elapsed time for exec st (*)
  0fa0d0e... Geary.Db.Statement: Minor code cleanup (*)
  940ca83... Geary.Db.Context: Remove separate `logging_parent` property (*)
  e39853d... Geary.ImapEngine.GenericAccount: Set database logging paren (*)
  0f60c28... Geary.Db: Update SQL logging (*)
  915a38f... Geary.ImapDb.Account: Slice up search table population work (*)
  3d8b86d... Geary.ImapDB.Folder: Drop create/merge batch size down (*)
  82f0ca8... Merge branch 'mjog/db-result-timing' into 'mainline'

(*) This commit already existed in another branch; no separate mail sent