LCS -> STRALGO LCS.

STRALGO should be a container for mostly read-only string
algorithms in Redis. The algorithms should have two main
characteristics:

1. They should be non trivial to compute, and often not part of
programming language standard libraries.
2. They should be fast enough that it is a good idea to have optimized C
implementations.

Next thing I would love to see? A small strings compression algorithm.

src/server.c

@@ -1006,7 +1006,7 @@ struct redisCommand redisCommandTable[] = {
      "admin no-script no-slowlog ok-loading ok-stale",
      0,NULL,0,0,0,0,0,0},
 
-    {"lcs",lcsCommand,-4,
+    {"stralgo",stralgoCommand,-2,
      "write use-memory @string",
      0,lcsGetKeys,0,0,0,0,0,0}
 };