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Fix typo

Provide link to releases and to installation instructions.

Use 'apk add' to install curl

Remove 'apt-get' command, raised 'not found'.

Simplify packaging by copying needed jar, and py libs and zip them up. This avoids having to compile on
each separate target platform.

Remove asset keyword.

Missing import, related to prev. commit.

In a previous commit, changes introduced in PR !27 (commit f3bb84d9) were deleted. These are now reintroduced.

* fix link to neisseria dataset
* add links to Smalt datasets