sync from master project

Fix the data generation scripts and code.  Regenerate the data.  Move everything to Gradle.

Remove an unneeded file.

Added the synoymns for the Messier objects.
Regenerated all the data files.

Regenerate the data and restore the missing layers.

First stage of switching from Ant to Gradle.  Creates gradle files and moves the app files to the correct location.  Note that at present the built app will crash due to a mismatch in the string ids that are now generated vs those long baked into the data files.

Documentation, build file and user help fixes.

Fix all of the data generation tools and eliminate unused shell scripts.  It's still a bloody mess.  It was so buggy I don't know how it ever worked.  Still to do: reintroduce synonyms.

and add a title

so replace with one pointing to github.

Add a .gitignore file.  Update the manifest file with a version update.  And a property to point to our release keys store.

Add instructions for generating local.properties

Since we're in github, use markdown.