doc update
Enhanced _gnutls_check_key_cert_match()

This function now performs a sign/verify test to check
whether the public and private keys match.
doc update
updated auto-generated files.
mark functions that are only available under FIPS140 mode
doc update
updated exported symbols table.
updated documentation
Added missing file
Do not include the FIPS140-specific functions into the main documentation.
Avoid unneeded dependency
link examples to GPL gnulib.
unconditionally zeroize temporal keys.
More strict checking of heartbeat padding size boundaries.

This will let us enforce RFC6520 minimum size for padding. Suggest by Peter Williams; initially investigated by Frank Li.
Allow decoding PKCS #8 files with ECC parameters from openssl.

These files do not contain the curve information with the private
key (ECPrivateKey), but they rather contain it in the privateKeyAlgorithm.
Added self tests for ECC PKCS #8 files.
doc update
corrected Peter's name!
Added the PFS priority string.
doc update