Deleted all studies
Removed redundant exists clause which is always true if other conditions are met
Merge pull request #26 from thehyve/improvement/remove-redundant-exists-clause

Removed redundant exists clause which is always true if other conditions...
Add samples maintenance scripts
Add dataset list downloading script
Download into samples/studies; adapt load targets
On dup dataset, assume mirroring
Merge pull request #27 from thehyve/external_studies

External studies
Remove id gen. trigger.

Id is inserted from the code using different db sequence.
Related change
https://github.com/transmart/transmart-extensions/pull/5
Merge thehyve/master into thehyve/london_hackathon

Conflicts:
	samples/common/Makefile
	samples/common/makefile.inc
Fix tar with --touch not using TAR_COMMAND
Merge pull request #26 from thehyve/london_hackathon

Changes from thehyve