added links to NCBI to Accession field

plain accession numbers were moved to the SeqID field
fixed bug in sequence substring for reverse-complemented sequences
this script did not work, so I did it manually.
It should be a one-time thing
added midpoint rooting, fixed to allow 'free-living' and 'Free-living'
fixed reporting of GetGroups step
modified to add link info to accessions field
added info about Nodularia and divergent Nostoc

NB, this is more recent than then compressed version
added Nodularia sequences and deeply divergent Nostocs
added Nodularia sequences and deeply diverging Nostocs
added Deeply diverged Nostoc sequence, renamed rbcX.fa

Deeply diverged Nostoc sequences not being pulled out by the N commune sequence
I added this sequence so that both will be used for blast and return a wider
range of hits