Inserts n1 at the end of L1

#appends the value "hello" to the end of list01
<-list01 "hello" AppendToList
#This is equivalent to "<-list01 <-list01 GetListCount "hello" SetListElement"

Sample list01:
0 - foo
1 - bar

Sample list01 after AppendToList command:
0 - foo
1 - bar
2 - hello