Some more tweaks to ENGINE code.
This change adds some basic control commands to the existing ENGINEs (except the software 'openssl' engine). All these engines currently load shared-libraries for hardware APIs, so they've all been given "SO_PATH" commands that will configure the chosen ENGINE to load its shared library from the given path. Eg. by calling; ENGINE_ctrl_cmd_string(e, "SO_PATH", <path>, 0). The nCipher 'chil' ENGINE has also had "FORK_CHECK" and "THREAD_LOCKING" commands added so these settings could be handled via application-level configuration rather than in application source code. Changes to "openssl engine" to test and examine these control commands will be made shortly. It will also provide the necessary tips to application programs wanting to support these dynamic control commands.
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