acc: added note about MySQL InnoDB not supporting INSERT DELAYED

- reported by Daniel Tryba

(cherry picked from commit d26eff22c8a543c63a40cd7d91bb3c70f04aabc6)
acc: regenerated README
tmrec: updated the examples with tmrec duration

- hint to read rfc2445 for duration format

(cherry picked from commit 99d1170469c60206992c083f2ba0e9dc6b580d37)