deletion: added sub deletion cases.

Sub-deletion case TREE_DELETION_CASE1 and TREE_DELETION_CASE2 are
now implemented.

Signed-off-by: Michel Megens <dev@michelmegens.net>
deletion: implemented all deltion cases.

All deletion cases are implemented. More debugging is necessery though.
Signed-off-by: Michel Megens <dev@michelmegens.net>