Flush out utility to create tdl's

[movitto]

Start implementing tdl-create the utility to create TDL's and eTDLs from scratch.

This utility should support two modes, one which takes command line options and creates the (e)TDL from those and one that interactively prompts the user for data to use in the TDL.

By default (if no command line options are passed in) the utility should create a minimal tdl.

TDLs will be printed to STDOUT unless an output file flag is specified