Titles and Dictionaries

• It is now possible to pass the title metadata through the system. This isn't required, and is helpful for ServiceX - when you want a transform to have a title.
• Support internal dictionaries. Much like tuples, these can be used to build an EDM and then unbuild them by referencing items in them.
• Code to allow other libraries to find the event dataset deep in the hierarchy

MetaData!

• Adds the MetaData method to ObjectStream.
• Adds a function to remove and return all MetaData from an ast.

Support recovering `EventDataset` from deep in hierarchy

• After using the find_EventDataset function, you can look at the _eds_object attribute to recover the original EventDataset object that started the whole query.

Support dictionaries

Support dictionaries inline (like tuples and lists) - they can be references, and the references will be resolved.

Change how EventDataSet arguments are stored

There should be no externally visible change.

Enables the python AST to contain complete information on the AST for EventDataSet - which will improve the flexibility and use cases like running on local files.

Actually get the title transforms in

• Will allow executor to accept a title argument

No user-facing changes other than to add the ability.

Add ability to specify a title with the transform

This will allow one to specify a title in the .value call.

Change how we pass EventDataSet information

Move to an argument style rather than an object style. Should make things simpler downstream.

• Should be no user-facing changes

Potential conflicts to downstream packages, however.

Add `Range` function

It is now possible to generate a sequence of numbers using the Range function. This allows you to iterate over a integers, for example, and use them as indicies into a function call - generating a sequence out of something that normally does not understand sequence semantics.

Currently supported only by the xAOD and CMS Run 1 AOD backends.

Adding the Range function

We have added the range function: allows one to iterate over a number sequence (like a for loop).

Many thanks to @sudo-panda for doing this work!