Release Tapasco 2019.6

    Major changes:
        - Vivado 2019.1 support
        - Detailed status information during Vivado runs
        - --skipEvaluation to shorten runtime for runs that do not rely
        on DSE
        - Increased compatibility of the evaluation by directly using
        IP-Xact instead of extracting the sources
        - Contributers guide added
        - Effort level for synthesis and place/route selectable (Uses
        flag --effortLevel)

    Bug fixes:
        - ZCU102 bitstream generation fixed
        - Increased PCIe interrupt reliability through ACKs
        - Vivado properly finishes and does not hang around
        - LED feature fixed and generalized
        - Various improvements to other platforms
        - Remove power report by default
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