Add support to (optionally) download the sequences

[Ewout1988]

• Customize this setting in the global-conf.xml file (name it sequence-details)
• If the user decides to support this option, two things should be possible:
  1. Downloading the tree with node tips from the 'Export' window should show the correct sequence labels
  2. Downloading the sequences from the 'Export' windows should give the user a msa (multiple sequence alignment) file containing sequences from the specific level.

[Ewout1988]

There is now support for the sequence-details in the global-conf.xml file If the deployed instance of the phylogeotool decides to support the downloading of sequences, the user can now do so through the 'View tree' window. In our case it is not supported for Euresist but it is supported for the dengue instance.

[Ewout1988]

Can someone please check if the download is sufficiently fast for the dengue instance? I'm don't have a fast connection available and it takes a while to fully download the dataset. In total it should be more or less 13MB.

[plibin]

Works fine to me.

[GuyBaele]

Works on my Mac as well.