Added Bahama Star mermaid.

Seriously, where are these names coming from?  Sun Star and Stella
Star kinda made sense.  Sugar Star was at least alliterative.
But Bahama Star?  I just don't get it.
Added Carcha mermaid.

Carcha seems to be a genus of moths?  I really don't know where these
names are coming from.  Heck, maybe her patterns are based on moths
for all I know.
Added a Rare Astronaut fish.
Fixed arrowhead direction for Chloe's dislike of Cool fish.
Added a Rare Rock Star fish.
Added rare Rock Star fish to the Model / Ninja group.
Removed excess Robber fish.
Added Taurus mermaid.
Added Midas mermaid.
Removed an excess Celestia mermaid.
Swapped the Temptress mermaid for a less conflicted one.
Added the Omnom mermaid.
Added Stoma mermaid.
Added a bunch of mermaids to look for new combinations.
Moved a new Onyx mermaid into the Kelp group, shortening the cycle.

Cycle was Onyx -> Tiger Lily -> Luau -> Opal -> Onyx,
is now Onyx -> Luau -> Opal -> Onyx,
so I should be able to drop a redundant Tiger Lily.
Removed some unpromising redundant mermaids.
Added a few more potentials to evaluate.
Added a Kelp mermaid to the Coral/Citrine group.
Removed now-redundant Onyx mermaid.
Added a Belladonna mermaid to the Velvet Twist/Charming Violet group.