aesni-sha1-x86_64.pl: add stiched decrypt procedure,
but keep it disabled, too little gain... Add some Atom-specific
optimization.
ssl/t1_enc.c: optimize PRF (suggested by Intel).
Use algorithm specific chains for certificates.

Fix a limitation in SSL_CTX_use_certificate_chain_file(): use algorithm
specific chains instead of the shared chain.

Update docs.
Add ServerInfoFile to SSL_CONF, update docs.
aesni-sha1-x86_64.pl: refine Atom-specific optimization.
(and update performance data, and fix typo)
sha/asm/sha256-armv4.pl: add NEON code path.
(and shave off cycle even from integer-only code)
Sync NEWS.