Takes one list of
commands and augments it with another list
of commands. The second list takes precedence
over the first list; that is, when both lists
contain a command with the same name, the command
from the second list is used.
Returns:
the augmented list
Parameters:
-
list1 - the first list, may be empty but not
null
-
list2 - the second list, may be empty but not
null