Merge pull request #1078 from dennishendriksen/master

Remove pubmed package from molgenis-core
Merge pull request #1079 from dennishendriksen/master

Sort DataSet drop-down list on startTime (most recent first)
fix dalliance
fix formatting
Merge pull request #1080 from bartcharbon/master

fix dalliance in dataexplorer
Improve error messages of data set deleter