Convert src-archive to use archive-source macro from svnbuild.xml.
Convert src-archive to use archive-source macro from svnbuild.xml.

Other changes:

* Remove the build and install directories and the unused install targets.

  The JAR files were copied to the install dir, and the archives were
  created in the build directory, and then the binary archive was
  copied to the install dir, and both archives were copied to the
  downloads dir. Now the JAR files are not copied and the archives are
  created in the downloads dir.

* Remove unused trunk.dir property.

Build unification changes:

* Make build the default target instead of everything.

* Drop -all suffixes from the clean, build, and downloads targets.

* Do not delete the downloads directory in clean.

This is part of the migration from Google Code to GitHub, and from
Subversion to Git.

Code review: https://codereview.appspot.com/223850043/

googlegsa/livelink.v3,googlegsa/livelink.v3