vbtodrupal 6.x-1.7

Changes since 6.x-1.6:

• by Liam McDermott: Fixed truncated password salt records importing from vB4.
• by Liam McDermott: Fixed broken logic determining which file records to import.
• by Liam McDermott: Fixed duplicate record error when attaching signatures to existing users.
• by Liam McDermott: Fixed vBulletin 4 moved split {attachment} into {attachment} and {filedata}.
• by Liam McDermott: Fixed table/column exists functions should not prepend the import database name to table names.
• by Liam McDermott: Fixed notices when checking for database port.
• by Liam McDermott: Fixed vbimportapi_import_db_*_exists functions should return a boolean.
• by Liam McDermott: Added API function that determines whether a table in the import database exists.
• #1062428 by Liam McDermott: Fixed error occurred while processing _vbtodrupal_fixbbcode().
• by Liam McDermott: Fixed incorrect function parameters.
• by Liam McDermott: Fixed import attachments and avatars from disk.
• by Liam McDermott: Fixed notice when redirect not set.
• by Liam McDermott: Fixed import with prefix set on import database not working.
• by Liam McDermott: Fixed include of non-existent file.
• by Liam McDermott: Fixed MySQL version check.