ELF Tool Chain Code

* Change the code examples in libdwarf's manual page set to use the
`EXIT_FAILURE` symbol instead of a numeric return code.
* Style fixes: use `.Bd -offset indent`.

Ticket: #356

Turn on SVN keyword expansion.

Ticket: #348

Fix errx call in the example section.

Minor tweaks to the `dwarf_get_ranges.3` manual page:
* Move compatibility information to a new top level section.
* A few -mdoc tweaks:
* Start sentences on new lines.
* Wrap long lines in the example.
* Adjust the whitespace on the page.

Ticket: #169, #170

Add manual page for dwarf_get_ranges and dwarf_get_ranges_a.

Ticket: #169, #170