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The generated Makefile by autogen.sh can now install standalone states and
summaries. This will allow sdi-plugins-prd to install states that doesn't
have a script associated, and install summaries too.

The summaries config file will be the autogen_summaries.conf.

To corectly use this feature, the user must have the "states" dir to install
standalone states, and the "summaries" dir to install standalone summaries.
Signed-off-by: Vinicius Ruoso <vkr07@c3sl.ufpr.br>