lib/bb/data.py:

lib/bb/data.py:
	-Provide a special 'collection/dict' for the collected
	 bb-files. If we use a persistent storage (CACHE) we will
	 not hold any data instance in memory but load it from disk
	 on demand.
	 This reduces bitbakes memory usage to roughly 40MB. The initial
	 parsing currently takes roughly thirty seconds more.

lib/bb/make.py:
	-Use the new data implementation for pkgdata.
	-Do not access pkgdata[f] if we've the data already
	 in our hands