Add "zip.tiny" and "zip.all" targets to build.xml.

* zip.tiny will create “dist/mcidasv-tiny.zip” that contains just
local-idv.jar and mcidasv.jar.

* zip.all will create “dist/mcidasv-alljars.zip” that contains the
McIDAS-V classpath.

Both targets will always overwrite their respective zip files, so no
need to worry about running the “clean” target.

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