1483 - *really* check color screens in scenarios

Required fixing two levels of bugs:

a) The hack in tangle to drop initial comments a '%' directive..

b) ..was masking a bug where run_mu_scenario wasn't robust to initial
comments.

Mildly concerned that neither of the sub-issues have their own tests,
but I'm just removing hacks, and writing tests for that throwaway
function like run_mu_scenario seems pointless. Instead I've solved the
problem by disallowing comments before '%' directives.

I've also taken this opportunity to at least try to document the
'scenarios' and '%' directives at the first layer where they appear.

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