Add new ilastik version 1.4.2

[k-dominik]

Submitting a Container

Add the latest ilastik version 1.4.2 to biocontainers

cc: @sunyi000

(If you're requesting for a new container, please check the procedure described here.

Check BioContainers' Dockerfile specifications

Checklist

1. Misc

• [na] My tool doesn't exist in BioConda -> it does, but it's a new version
• The image can be built

2. Metadata

• LABEL base_image
• LABEL version
• LABEL software.version
• LABEL about.summary
• LABEL about.home
• LABEL about.license
• MAINTAINER

3. Extra (optionals)

• I have written tests in test-cmds.txt
• LABEL extra.identifier
• LABEL about.documentation
• LABEL about.license_file
• LABEL about.tags

Check BioContainers' Dockerfile metadata

[k-dominik]

Okay, this builds and is ready for review!

[mboudet]

Just for information, the My tool doesn't exist in [BioConda](https://github.com/BioContainers/containers/pull/620#make-sure-your-tool-isnt-already-present-in-bioconda) means 'is it available as a conda package (ie, in bioconda-recipes and https://bioconda.github.io/)`, not whether or not its in this repo

[k-dominik]

aww alright! Thank you for the clarification - and the review / merge!