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updates the artefact_tag and view_tag tables to change profile to the new language

This reverts commit 228a8fd8.

also bringing comment up to date

This involves making sure that the lastauthinstance field of the usr table doesn't refer to the auth instance too.

Work around a bug in insert_record, where the table columns were cached for a table the first time the table was inserted into, making it impossible to do inserts into the table in the same request if the table is changed.

Added a global variable, $INSERTRECORD_NOCACHE, that can be set in order to force re-looking up the table columns.

Use this feature to fix the installation of the forum interaction activity type "new post" when upgrading.

Force the installation of the 'fileimagevideo' blocktype category the correct way (using install_blocktype_categories()), so it doesn't fail if the category has already been created, as can happen if we are upgrading from 0.8.

Add a new function, plugin_types_installed(), which returns only those plugin types that are installed.

Use this function when handling events so we don't attempt to send events to plugins that aren't available.

Fix a problem I introduced while improving the appearance of feedback on views, where marking feedback private was broken.

All the language strings are now done by $getstring rather than getting strings on the javascript side, and marking feedback private now displays the correct message after the update has been done.

changing search_user_my searching of preferred name vs first/last name to bring in line with search_user_pg

- views accessable only to tutors only show up for tutors
- the members ordered by firstname, lastname, id
- views ordered by title, id
- owner is so labelled in the memberlist
- checking to prevent removing the group owner from the group