0.5.8:

This patch release follows several important bug-fixes, as well as the
addition and integration of error trace support.

- install mode: support the -f (force copy) command line argument.
- link mode: properly use dependency information associated with .la wrappers.
- link mode: ignore -rpath when deciding whether to create an executable.
- utility: added error trace support, integration, and annotated output.
- library: added public error trace interfaces.
- argv.h: error message formatting: handle lonely long options.
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