This program illustrates the use of a general "inserter", which can be used
if the recipient container supports the insert() member function.
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First we display the contents of a character vector of size 6 on one line,
and the contents of a character list of size 6 on the next line:
AAAAAA
BBBBBB
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Then we use an "inserter" to insert the contents of the character list into
the character vector, beginning at position 4, and display the contents of
the revised vector to confirm:
AAABBBBBBAAA
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Finallly, we again use an inserter to insert the contents of that revised
character vector back into the character list, also beginning at position 4,
and display the contents of the revised list to confirm:
BBBAAABBBBBBAAABBB
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