Rework of the 'Import X' feature
I need to rework this feature a little before to continue to add improvements on it.
Actually, the URL to import a thread is: projectpost.php?do=importissue1&t=x
The URL to import a post is: projectpost.php?do=importissue1&t=X&p=Y
I prefer to remove the t=X from the second URL to be able to add more source for the importer.