Latest changes to include new pattern/strategies from export XML files.
Merge branch 'develop' into release/1.7

Conflicts:
	commands/LegacyFieldsCommand.php
	models/Element_OphInVisualfields_Image.php
Initial pass at anonymising TIF file, although PID still shows first three characters.
Merge branch 'develop' into release/1.7
Merge branch 'release/1.7' of https://github.com/openeyes/OphInVisualfields into release/1.7

Conflicts:
	commands/AnonymiseFieldsCommand.php
Fixed error.
Image redaction change. Added date, time and age to list of items to be removed. Made areas larger for text blanking.
Removed code from another branch, error commit.