Fixed bug when doing rnd_read followed by update.
Don't duplicate error messages in log
Initialize transaction object properly. Fixed failure in event*tests when running with maria


mysql-test/mysql-test-run.pl:
  Removed warning when running with --external
mysql-test/r/maria.result:
  Added back disabled test
  Verified that the result changes are correct
mysql-test/t/maria.test:
  Added back disabled test
sql/handler.cc:
  More debugging.
  Simple style change
sql/sql_class.cc:
  Initialize transaction object properly. Fixed failure in event*tests when running with maria
storage/maria/ha_maria.cc:
  More dbug info
storage/maria/ma_blockrec.c:
  Removed not needed line
storage/maria/ma_rrnd.c:
  Removed not used code
  Ensure that cur_row.lastpos is always set when reading record with rnd. (Fixes failure in maria.test)
storage/maria/maria_def.h:
  Don't call maria_print_error() except with EXTRA_DEBUG
  (Removes duplicate error messages when somethings goes wrong)