Get Fucntion Name of Current Analytic
DESCRIPTION:
Returns the function name for the currently-running analytic.
USAGE:
spserver.analytic.function()
VALUE:
The function name of the currently-running analytic,
which is the same as the last directory element of the analytic name.
Returns an empty string if there is no currently-running analytic.
EXAMPLES:
# spserver.analytic.function()