Request: In single-threaded debug mode, don't hide exceptions from the calling thread.
tests: Allow tests to run (or get skipped) in single-threaded debug mode.
OpArrayCache: Never attempt to free a cache that has "in-process" blocks, and use a shape of () for resizing.
Merge branch 'master' into multiprocess-hdf5
Request: In single-threaded debug mode, don't hide exceptions from the calling thread.
tests: Allow tests to run (or get skipped) in single-threaded debug mode.
Merge branch 'master' into multiprocess-hdf5