1st CRAN release plan

[eblondel]

• Set-up stack of Integration tests #40 Set of Integration tests ready (to be further enriched later)
• Apply strict R6 class documentation with roxygen2 #249 Apply strict R6 class documentation with roxygen2
• Need 'd4storagehub4R' package to be published on CRAN (https://github.com/eblondel/d4storagehub4R)
• Need 'thredds' package to be published on CRAN (Release on CRAN? BigelowLab/thredds#3)
• Need 'atom4R' package to be published on CRAN (Release on CRAN eblondel/atom4R#3)
• Need 'geonode4R' package to be published on CRAN (Release On CRAN eblondel/geonode4R#10)
• Need 'geometa' package update (version 0.8)
• Review title and description with co-authors @juldebar @wheintz @abennici
• Submission to CRAN