Sync with thehyve/master; new high dim API

Merges thehyve/master into transmart/master. Almost all changes are related to the new API for retrieving high dimensional data.

The following module were removed, as they are not supported on postgres: `mirna`, `protein`, `rnaseq_cog`, `rbm`.

For more information, see [the RFC](https://wiki.transmartfoundation.org/display/TSMTGPL/API+for+High+Dimensional+Data).