finished validation of sub question fragments
saving question data
saving question data
move responsibility for storing all

question instance data into question
instance objects.
fixing problems highlighted by code sniffer
fixing saving of fraction for choices
populating form with  common question type properties

'generalfeedback' and 'defaultmark'
populating form with question type options
Merge branch 'add_question_type_to_question_identifier'

Conflicts:
	combinable/gapselect/combinable.php
	combinable/oumultiresponse/combinable.php
	combiner.php
code to show the correct no of blanks in subqs