More + more accurately named clonal family fasta downloads

[eharkins]

As it is now we have:

• "Download Fasta: Unique Sequences In This Tree" which is named like <clonal_family.id>.fasta
• " Download Fasta: Lineage Sequences" which is named like <lineage_sequence.id>-lineage.fasta

In a recent meeting with @lauradoepker, we settled on the following options instead (names of buttons tbd but behavior and file names are what's important):

• Download tree sequences: Should include ASR + leaves and file should be labeled with -indels-reversed if the sequences from partis used came from the inde_reversed_seqs key
• Download original leaves: Should include only non-indel-reversed original sampled sequences from the cluster from the partis input_seqs key. (Should we label to emphasize non-indel-reversed status?)
• Download lineage: Should include lineage sequences from selected sequence to naive, and file name should reflect indel status in the same way as the tree sequences by adding -indels-reversed if the indel_reversed_seqs key was used from the partis output for any of the cluster sequences