Differentiate LOG_EVERYTHING and LOG_FULL_TEXTVIEW_CONTENTS

Previously, LOG_EVERYTHING logged both all bigrams and also the entire TextView at the end of a
session.  Now, use a separate flag, LOG_FULL_TEXTVIEW_CONTENTS to determine whether the TextView
contents are recorded.

Change-Id: I0c7a90a8ff88aa65d057f3b2d3dd5adc3893504a