append - Append an object to a string or array.
(string) int append -> string
[array] obj append -> array
(hello) 44 append -> (hello,) (44 is ASCII value for ,)
[1 2 3] (hello) append -> [1 2 3 (hello)]
[1 2 3] 44 append -> [1 2 3 44]
docu by Sirko Straube, Marc-Oliver Gewaltig
/var/www/debian/nest/nest-simulator-2.20.0/sli/slidata.cc