This change adds cipher and digest support into ENGINE using the
ENGING_TABLE mechanism. The necessary hooks from crypto/evp/ to use this
will be committed shortly.

This change replaces the ENGINE's underlying mechanics with the new
ENGINE_TABLE-based stuff - as described in crypto/engine/README.

Associated miscellaneous changes;
- the previous

This change replaces the ENGINE's underlying mechanics with the new
ENGINE_TABLE-based stuff - as described in crypto/engine/README.

Associated miscellaneous changes;
- the previous cipher/digest hooks that hardwired directly to EVP's
OBJ_NAME-based storage have been backed out. New cipher/digest support
has been constructed and will be committed shortly.
- each implementation defines its own ENGINE_load_<name> function now.
- the "openssl" ENGINE isn't needed or loaded any more.
- core (not algorithm or class specific) ENGINE code has been split into
multiple files to increase readability and decrease linker bloat.
- ENGINE_cpy() has been removed as it wasn't really a good idea in the
first place and now, because of registration issues, can't be
meaningfully defined any more.
- BN_MOD_EXP[_CRT] support is removed as per the README.
- a bug in enginetest.c has been fixed.

NB: This commit almost certainly breaks compilation until subsequent
changes are committed.

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Some of the ENGINE file names were changed for 8.3 filename uniqueness
recently. So comments including file names have been fixed, and copyright
notices brought up to "2001" at the same time.

Fix a typo in the preprocessor logic in eng_list.c that had left RSA, DSA,
and DH all conditional upon OPENSSL_NO_RSA.

make engine file names unique in 8.3