Adding author notices to script help messages

More docs

Adding missing spectrum files

Removing .entries usage from slhaplot

Typo fix

Adding a dict arg (compatible with dict.update) to the Block constructor.

Adding Block.set_value(*args) and Block documentation.

Removing inappropriate uses of add_entry

Removing more indirections via .entries

More cleaning up with use of the updated Block API, and adding a keys() method

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