transition document.
Remoted plain text release_notes moving forward. Created a markdown
version of the README file as an experiment to see what we think.
GitHub will render markdown natively, as does Doxygen and our new
build system.
-DENABLE_DYNAMIC_LOADING to cmake-based builds.
This will allow for compatibility with hdf5 1.8.11 builds that
have enabled dynamic building (depends on libdl).
See Jira ticket NCF-258