Release v1.1.11.0

This release implements the changes necessary to make trident capable of handling packages specified for the new Poseidon standard v2.7.0:

• A Poseidon package can now include a .ssf file ("sequencing source file") as specified. trident considers it in validate, update, survey and, most importantly, forge, where .ssf files are compiled for new packages just as .janno files.
• trident now understands and validates the new .janno columns Country_ISO and Library_Names.
• trident now knows the possible value mixed for the .janno column Library_Built.

The behaviour of trident for older package schema versions (v2.5.0 and v2.6.0) should be mostly unchanged. forge and init now return Poseidon v2.7.0 packages, though.