Added OVERRIDE and FINAL.
Moved evals_since_yield to where the rest of the fields are.
Made private fields of env_t be postfix-underscored.
Made env_t::global_optargs_ be private.
Removed unused env_t::global_optargs() method.
Made env_t::limits_ be private.
Made env_t::reql_version_ be private.
Merge branch 'next' into sam_2156_upter
Defined GNUC_VERSION.
Made real_table_t be FINAL.
Merge branch 'sam_2156_upter' into next
Removed dated TODO about updating latest_checked.  OTS by @tryneus.