Add methods to append certain nodes to session data in order to avoid session saving race conditions. Fixes #1488422
Check for exact matching session keys before splitting into path segments. Adds backwards-compatibility after commit f0a7159c
Fix typo
Hack to reset PDO statement iterators after counting
Update changelog
Fix copying messages to a folder with "empty" name e.g. "0", better error handling
Fix selecting collapsed rows on select-all (#1489036)

Conflicts:

	CHANGELOG
Fix selecting collapsed rows when using selection with Shift/Ctrl key
Fix handling of invalid characters in message headers and output (#1489032)

Conflicts:

	CHANGELOG
Skip filename suffix check for embedded images; return blocked.gif instead of HTML warning when embedded (#1489029)
Set minimal permissions to temp files (#148899)
Updated changelog
Fix ticket reference
Fix display of HTML entities in protected folder name (#1489042)
Bump version to 0.9-stable
Merge branch 'release-0.9' into rutgers_release-0.9