Hide footer, header of print page

- mozilla - add attrs moznomarginboxes mozdisallowselectionprint of html element
- chrome and other browsers - remove @page margin and set body margin
Pring header/footer fix

- set back @page margin for default print
DateToString filter

- filter that converts numeric date value to string
EventRegistry - supports entity-created event.
NumberMangler- [FINISHED #78890862]
CsvImport added method to support conversion to numbers [FINISHED #78890808]
Schema editor tabs used instead spaces.
Sequencers-support for next higher. (max+1).
Removed some silly logging.