The module entropy_path_loader (used only for running from within the
checkout; otherwise not even installed) is made to provide the _entropy
namespace.
(Other ideas instead of this entropy_path_loader change would be to
reorganise files layout; drop support for running from the checkout as
is - and perhaps require virtualenvs; require sourcing a script that
sets PYTHONPATH. However, as implemented, it is not intrusive, and the
good part is that it is quite isolated, not used in normal usage after
installation. Basically, it only does sys.path + provides _entropy
namespace.)
This makes possible to avoid directory hot spots on repository mirrors.
This commit requires some mileage and real-world testing, but it
seems to be running good on a relatively small repository.
No backward compatibility issues have been reported.
The old "dependencies" metadata is deprecated. It was found that
the generated metadata might get corrupted by colliding atom strings.
The new implementation avoids collisions completely and is more
efficient.
etpConst['clientdbid'] is kept for backward compatibility, but will be removed soon
While etpConst['serverdbid'] and etpConst['clientserverrepoid'] are gone.
