Legacy URL Support

As Elgg has been developed, the URLs for pages have changed.

Elgg 1.8

Beginning all pages with the 'pg' prefix was deprecated.

The tag pages were replaced by search

Name		Name	Last commit message	Last commit date
languages		languages
tests/phpunit/unit/Elgg/LegacyUrls		tests/phpunit/unit/Elgg/LegacyUrls
views/default		views/default
README.md		README.md
composer.json		composer.json
manifest.xml		manifest.xml
start.php		start.php