Fix whitespace.
Handle case of "chunked" (BER) OCTET STRINGs in ContentInfo Data.

- Some pkcs12/7 encoders (some Apple code?) will output OCTET
  STRINGs that are constructed/composed of chunks, each that is
  another OCTET STRING containing part of the value of the
  original OCTET STRING. This is BER-encoding vs. DER-encoding.
  These are now decoded when detected in PKCS#12 input.
- The same encoders as above may include empty safe contents in
  their output -- this is now handled in non-strict mode as well
  and may also be related to BER-encoding.
More docs on special BER-encoded Data case.
Release 0.6.1.
Start 0.6.2.