Merge pull request #392 in HDFFV/hdf5 from ~LRKNOX/hdf5_lrk:hdf5_1_10_1 to hdf5_1_10_1
* commit '8c06d9564ed7662899e6a3e3a8cd96127b70833c':
Update RELEASE.txt with note for fixing failed SWMR tests.
Switch to using flag in signal handler, to trigger dropping out of main loop and shutdown cleanly, instead of calling leave() from the signal handler.
Fix HDFFV-8089 Description: Some code within an "ifdef H5D_CHUNK_DEBUG" block was using outdated data structure but not caught because the case of H5D_CHUNK_DEBUG being defined was never tested. It was commented out. I defined H5D_CHUNK_DEBUG, tested, and commented out again. Platforms tested: Linux/32 2.6 (jam) Linux/64 (platypus) Darwin (osx1010test)
