Modifications for proper archive creation.
Merge pull request #194 from ISA-tools/development

Merging development with master
Minor refactoring.

 Shortened method in NewFolderWindow by extracting button creation code.
 Prevented null pointer when no mode is specified by defaulting to Mode.NORMAL.
Merge branch 'development' of github.com:ISA-tools/ISAcreator into development
Merge branch 'master' into development