add several new linked list functions

add cx_linked_list_find()

add linked list tests for cxListAt()

add more nonnull attributes

add more explicit documentation to cx_linked_list_remove()

change contract of cx_linked_list_remove()

(0) -300 -100 -30 -10 -6 +6 +10 +30 +100 +300 tip

mercurial