- Optional modules are lazily loaded with "eval 'use MODULE'" in BEGIN phase, and be checked availability testing $MODULE::VERSION variable which all modern CPAN modules will have.
- tools::smime_parse_cert(): Now it takes arguments with plain hash instead of hashref.
- tools::smime_find_keys(): Now it takes context (Sympa::List or site) instead of directory.
- List::get_cert() returns scalar instead of array.
- Use Crypt::OpenSSL::X509 instead of openssl to parse certificates.
- Use list-style open() to open pipes.

Issues:
- Certificates and keys for sympa and/or listmaster should be able to be prepared per robots;
- and they should be placed in $robot->{etc}, instead of "$robot->{home}/sympa".
- Use any CPAN module instead of "openssl pkcs7" to extract certificates in signed messages.


git-svn-id: https://subversion.renater.fr/sympa/branches/sympa-6.2-branch@11280 05aa8bb8-cd2b-0410-b1d7-8918dfa770ce