Half of this (the base library part) was already on master.

Import refactor: moved the transporter classes out of files importer and into base library

very manual cherry of f5c4ed7b

reworked to live in new import/file plugin

Original commit message:
not strictly LEAP related: refactored mnet import stuff into new Plugin architecture.

Remove ?> marker from config-dist.php, which will prevent people breaking their site with whitespace issues.

Only changing this file because it's the one people touch the most.
(cherry picked from commit 0defc9c3)

It's still really basic, but at least now it doesn't look stupid when a user hasn't filled out most of their resume.

(cherry picked from commit f134754c2583647bcbf0c65c31efadb469b1eca2)

Include all stylesheets in the theme hierarchy so the progress bar looks correct even when using a child theme.
(cherry picked from commit 6813e29bb6be7721921923644ed340ca80d03ea3)

This patch changes the behaviour to be thus:

- If the artefact now has no parent, we can safely remove all records in the APC
- If it does have a parent, insert a non-dirty record representing that relationship
- Mark all other rows referencing the artefact as dirty - we can't make any more conclusions at this point.

The cronjob will come through and clean up the dirty rows, as it always has done.
(cherry picked from commit bdca8220ebddf155bffa26c34f48c5795a774e0b)

How were we not doing this before?!
(cherry picked from commit 3e2222b01157bbfbbae7fd92ebc7c13f44b0a233)

(cherry picked from commit bcb10a104ec9dfa076decd85ea0f6b62fddd3cd0)

Copy plugin related files to directories without adding extra useless export/html/ directories to their paths.

Reverse the order of the stylesheets before smarty starts using them, so parent stylesheets are first.

Also destroy the session when creating a new user, to prevent strange session-out-of-sync problems. I think they only happen when a crash happens while creating a user account but you can't be too careful.

This probably needs calling in a few places, especially when the currently logged in user changes while the session is hanging around.