When  splitting a topic is possible to move the new topic to a different board, plus it is possible to leave a message where the posts have been moved

Signed-off-by: emanuele <emanuele45@gmail.com>

Conflicts:

	sources/subs/Boards.subs.php
	sources/subs/Topic.subs.php
A small parameter to decide the behaviour of the "current board" in the dropdown: disabled or selected

Signed-off-by: emanuele <emanuele45@gmail.com>
These are followups or whatever they would be called

Signed-off-by: emanuele <emanuele45@gmail.com>

Conflicts:

	sources/subs/Messages.subs.php
	sources/subs/Topic.subs.php
Improved getBoardList to include inclusion by permission (through boardsAllowedTo)

Signed-off-by: emanuele <emanuele45@gmail.com>

Conflicts:

	sources/controllers/Post.controller.php
	sources/subs/Boards.subs.php
The quote-to-new button is displayed correctly now (to people that have permission to post new topics in at least a board + some invalid xhtml error with certain combination of permissions

Signed-off-by: emanuele <emanuele45@gmail.com>
Separated functions to their own file, removed original messages when deleting a topic, added scheduled task to remove follow-ups when a topic is deleted, some documentation, other things

Signed-off-by: emanuele <emanuele45@gmail.com>
Merge branch 'master' into split_to_new_2

Conflicts:
	themes/default/Display.template.php
Merge pull request #269 from emanuele45/split_to_new_2

Split to new 2