fix "describe" to work on both data segment and heap

the hard part was figuring out the generic test for docol. it doesn't really test for docol, it tests for self-codewords and treats everything else as if it uses docol... not ideal, but good enough for now

this also involved hardcoding the name "0branch" as an alternative to "zbranch". again, not a long-term strategy, but the long-term strategy is to remove flatassembler entirely, at which point the old names will go away because we'll be using our own lexer.

there were also a couple small code-validity things that either broke the "describe" output, or became evident because of it, which are now fixed as well.

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Change-Id: If6641bb27f4fb0308f6fd4a2f4885215187ec8d9

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