handle indentifiers.org urls with https

Closed Clement Frainay requested to merge bugfix/annotImport into master

Met4J IO parse xref only if it has a valid identifiers.org uri. Since identifiers.org changed to https, the validity check now accept both http and https uri.

The default base uri is also switched to https in met4J However, this means that a sbml with http://identifiers.org/ xref will be converted to https:// after export from bionetwork

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