Merging in latest from upstream (HDFFV/hdf5:refs/heads/hdf5_1_8)
* commit '37484b0d8b7e1cab7f31aae6d811cb71c66bc073': (30 commits)
Version string at top of README.txt and release_docs/RELEASE.txt updated by bin/release.
Update URLs in RELEASE.txt.
Set version and commit release script changes for 1.8.18 release.
Update HDF5 document URLs in RELEASE.txt.
Description: Replaced an incorrect work-around note with info about future feature to fix the problem.
Change default build mode to production. Update version to 1.8.18-pre2.
Update versions for actual 1.8.18-pre1 release.
Add GIT note
Updates to RELEASE.txt to account for changes in the 1.8.18 release
Updates to RELEASE.txt to account for changes in the 1.8.18 release
Updated optional CMake scripts
Updates to RELEASE.txt to account for changes in the 1.8.18 release.
Remove ADA machine no longer tested from "Supported Platforms". Correct typo: missing '(' for Mac OS 10.11 compiler information.
Updates to RELEASE.txt to account for changes in the 1.8.18 release.
Add bin/compile, bin/depcomp and bin/missing which were changed to links by libtool.
Rerun libtoolize with -cf, then reconfigure.
Created pre1 release files.
Check in ltmain.sh and m4 files after running libtoolize with version 2.4.6.
Update Windows tested platforms information.
Update shared object file numbers according to changes in v1.8.18 release. Update autotools and libtool versions. Run bin/reconfigure.
...
