Libdwarf version 0.4.2

[davea42]

We believe all memory leaks have been removed from dwarfdump
and from libdwarf. How to deal with a dwarf_init*() call
that fails (DW_DLV_ERROR) in a simple way is finally
documented in libdwarf.pdf and in the on-line html.

There are no API changes and no API deletions.

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This discussion was created from the release Libdwarf version 0.4.2.