Fix problems in the data directories by making the following changes.
Change 'core.zip' to 'common.zip' (or cldr-common-30.0.3.zip to cldr-core-30.0.3.zip), consistently.
Add a ReadMe.txt with the following contents:
add a section that talks about the data directories with the above information.
In http://cldr.unicode.org/index/downloads#Repository_Organization, mark which directories are in the data directories, and which are only available via svn. Some other fixes need to be made; for example, the text has: "common — CLDR data corresponding to the release", but common is *not* all the data corresponding to the release; keyboards contains data corresponding to the release. And "seed" is in the release, but just in SVN, not in the data directory. Probably best to, say, bold the sections that are in http://unicode.org/Public/cldr, and have a sentence that says that the bolded sections are in the data directories while the others are available via SVN.
I would suggest making these changes back to http://www.unicode.org/Public/cldr/30/
=== Background ===
In 30.0.3 we innovated by adding versioned files:
[ ] cldr-common-30.0.3.zip 13-Dec-2016 10:50 15M
[ ] cldr-keyboards-30.0.3.zip 13-Dec-2016 10:50 1.3M
[ ] cldr-tools-30.0.3.zip 13-Dec-2016 10:53 29M
[ ] core.zip 13-Dec-2016 10:50 15M
[ ] keyboards.zip 13-Dec-2016 10:50 1.3M
[ ] tools.zip 13-Dec-2016 10:53 29M
But there are a number of problems that this exposes.
The 'core' and 'common' mean the same thing here, but confusingly use different names.
Also, someone going to the directory could be confused into thinking that the versioned and non-versioned files are different.
Longer term problems are also exposed, that it isn't clear that the data is not everything in the release, etc.