Problem: there is no constant argument attribute
Problem: there is no constant argument attribute

Solution: rename to mutable

TODO: current implementation maybe prints more mutable arguments, but
generated zchunk.xml does not change function prototypes, which is
great!

hintjens/zproject,eburkitt/zproject,twhittock/zproject,paddor/zproject,paddor/zproject,taotetek/zproject,paddor/zproject,taotetek/zproject,taotetek/zproject,keent/zproject,keent/zproject,zeromq/zproject,zeromq/zproject,zeromq/zproject,asokoloski/zproject,hintjens/zproject,twhittock/zproject,eburkitt/zproject,asokoloski/zproject