R39-5

• bug-fix: mysql_format formats special negative floats with precision wrong (issue #90)
• bug-fix: query result processing is skipped on ORM-generated queries when no callback is specified (issue #80)
• bug-fix: plugin crashes on rare occasions when an internal MySQL query result row is copied (possibly issue #57, #73)
• minor fix in orm_delete
• queries generated by the ORM system are now printed as debug information