Allow multiple data files

[syclik]

Summary:

Allow multiple data files. Use cases:

• specifying ODE tolerance arguments
• providing inputs that control generated quantities

Description:

Allow multiple data files to be specified. Specifics:

• If the same variable is defined in multiple files, use the value in the last file provided
• Allow for multiple definitions of the same variable across different files

Current Output:

--data_file option only takes one argument. Change this so it takes multiple arguments.

Additional Information:

Feature.

Current Version:

v2.26.1