three types of array-creation / array-deletion functions:

char*
UNISTR2*
SID*

decided to create a higher-order function set, add_item_to_array()
free_item_array().

higher-order support routines needed to add a new type:

type* item_dup(const type*)
void item_free(type*)

of course, strdup() and free() are perfect, pre-existing examples
of such functions, used in the implementation of add_chars_to_array()
and free_char_array().

sid_dup() and free() work for the add_sids_to_array() and free_sid_array()
implementations.

use unistr2_dup() and created unistr2_free() because the functionality
behind these may change into something horrible, like [horror] dynamic
memory allocation of the UNISTR2 character array.  argh!!!!

jean-francois, this function set implements what we talked about over...
a year ago, now :-)
(This used to be commit a80ea2eb47d298095eb6e5b0455309daa3a631cb)

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