Project support

Nikos Tsardakas Renhult helped fixing an unfortunate color choice.
Karin Lagesen @karinlag and Juan Villada @juanvillada had constructive suggestions when reviewing the paper for JOSS.
@katieemalianova help chase down installation issues.
@SimonGreenhill added support for the Nexus format.
Roey Angel reported bug about alv not guessing the MSA type correctly when a DNA/RNA sequence is completely without "codons".