Unnecessary external reload dialog

Issue: http://netbeans.org/bugzilla/show_bug.cgi?id=203477
Description: fileEvent.getTime() was usually newer than fo.lastModified() 
after a save. This resulted in an inconsistency in DataEditorSupport internal 
state and an unwanted "do you want to reload?" dialog was shown.
Risk: Code that relies on fileEvent.getTime() may be at slight risk, 
especially if the clock time and filesystem time are not synchronized
Change set: http://hg.netbeans.org/ergonomics/rev/aa9820476791