First step in what is very possibly an Unwise Move<tm>.

--HG--
rename : catalog/scheme.catalog => catalog/chicken.catalog
rename : catalog/catseye-forks.catalog => catalog/collection/catseye-forks.catalog
rename : catalog/catseye-stars.catalog => catalog/collection/catseye-stars.catalog
rename : catalog/catseye.catalog => catalog/collection/catseye.catalog
rename : catalog/emulators.catalog => catalog/collection/emulators.catalog
rename : catalog/fundaments.catalog => catalog/collection/fundaments.catalog
rename : catalog/pypi.catalog => catalog/collection/python.catalog
Split more out of monolithic catalogs into microcatalogs.
Add build_requires and test_requires cookie hints.