ASN: Use all asn files of the project

It's mandatory to support multiple ASN.1 files in a project. The file referenced in the MSC model is only used when using the standlone MSC editor I suppose, otherwise you use the types parsed by the IV editor, right? In you can confirm then two options:

1. either support multiple "data fileN.asn;" in the MSC document
2. or save always "dataview-uniq.asn", which is a file that is generated duiring the build as a concatenation of all .asn files

Option 1) implies to update all msc files of the project each time a new ASN.1 file is added. This may not be a very good idea