Fix to the License naming clash issue

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- Instead of LICENSE used COPYING (it's accepted see:
http://www.theregister.co.uk/2013/04/18/github_licensing_study)
- removed license.txt inside license dir to avoid unnecessary
duplications or clash of license of the ospos code. COPYING is anyway a
rename of LICENSE that was a newer version than the one in
license/license.txt

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