KrakenUniq v0.7.3

This maintenance release provides the following updates:
(1) fixes issues with building large databases
(2) installs Jellyfish version 1 KRAKENUNIQ_INSTALL_DIR/jellyfish-install/bin/, if -j switch is used (KrakenUniq requires Jellyfish version 1 to build databases)
(3) fixes --work-on-disk option (#97)

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