jg_gram.y -- ary_idx now accepts an optional increment
parse_glist.c -- collect key list code in obj_selector() into key_list() so I can use it in ary_selector()
Added code to ary_selector() to allow [k1, ... ] for use with objects used as hashed arrays
exec_glist.c -- Added code that handles [k, ...], ie treats objects like hashed arrays