updated documentation for gnutls_pkcs12_simple_parse
updated gnulib
updated to libopts 5.18.3
gnutls.h: use _SYM_EXPORT to export other than function symbols
several windows compilation fixes
removed debugging info
pkcs12: increased the number of iterations for MAC
PKCS #8 encryption support was made more compact and manageable
added new functions to obtain information on PKCS #8 structures.

Added gnutls_pkcs8_info(), gnutls_pkcs_schema_get_name(),
and gnutls_pkcs_schema_get_oid().
certtool: added --p8-info option
doc update
small fixes and optimizations in PKCS #8 information
tests: added more PKCS #8 decoding tests
certtool: improved PKCS #8 information printing
further increase iteration count
simplified decrypt_data() and initialize parameters on decryption
doc update
doc: replaced non-0 with non-zero
gnutls_pkcs8_info: will return OID value even on unsupported structures
certtool: default pkcs-cipher is now 3des as in PKCS #12