v0.6.0

Relase for ISAtab exporting, ISAtab handling updates and sample sheet rendering improvements.

• Add ISAtab exporting
• Upgrade to altamISA v0.2.5, refactor importing for full ISA model support
• Add rendering for multiple missing columns
• Add saving of original ISAtab data into the SODAR database
• Add IGV merge shortcuts
• Add multi-file ISAtab importing
• Enforce row order in studies
• Replace TSV table export with Excel export
• Add support for panel sequencing and metabolite profiling in assays
• Upgrade to django-sodar-core v0.7.0
• Fix major issues with multi-cell copying
• Numerous minor updates and fixes

See changelog for a complete list of updates.