File hooks enhancement: new MX_FILEHOOK flag HFF_DATA_CHG_ONLY (&h00020000) may be used in conjunction with HFE_POST_WRITE to suppress calling the hook function after the write if the record data hasn't changed.
The new flag is defined in the updated ASHINC:HOOK.DEF
The EXLIB hook test program FHOOKTST1.BP[908,50] and sample hook routine FHOOK1.BP[908,50] have been updated to test/demo new flag.
