Synopsis:
   $count(<string> <text>)

Technical:
   This function counts how many times <string> appears in the text specified
   by <text>, possibly overlapping. 

Practical:
   The uses for a function like this are unlimited.  One may be to count how
   many times a person's nick appears in a public message, for logging
   purposes.

Returns:
   number of times <string> is found in <text>

Examples:
   $count(. one.two.three)          returns 2
   $count(zz zzzz)                  returns 3