List namespaces that are in the same group as the given namespace.
Arguments:
1. "namespace" (string) namespace Id
2. "maxage" (numeric, optional, default=96000) only consider namespaces updated in the last "maxage" blocks; 0 means all namespaces
3. "from" (numeric, optional, default=0) return from this position onward; index starts at 0
4. "nb" (numeric, optional, default=0) return only "nb" entries; 0 means all
5. "stat" (string, optional) if set to the string "stat", print statistics instead of returning the names
keva_group_show ("namespaceId" ("regexp" ("from" ("nb" ("stat")))))
second argument must be
maxage
: