add top-level conda build to avoid rebuild in subs #2208
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Adjusts the conda recipe to do the build of all components once, and then uses the subpackage scripts to bundle the produced binaries appropriately into $PREFIX.
This is a draft. I've put it up for discussion and awarenesss, but it's not really ready yet. In particular, the script_env stuff is broken. I don't really understand the scoping rules in YAML, but it seems that declaring the anchor section in the top-level build section does not make it available in the outputs.
fix #2175