a new library function named "season_from_month()"

Hereby I am attaching a new library function named "*season_from_month()*"
This is adapted from D Shea's month_to_seasonN() and month_to_season12()
functions, with some slight difference in script, but enterly different
usage which enables *objective definision of season*.

The previous versions handles only the seasons with 3 month length where as
the new function *season_from_month()* allow user to define the season of
any length objectively. For example Indian summer monsoon season JJAS can be
defined as

jjas = season_from_month (xMon, 6, 9, JJAS)

The function has four arguments.

Arg1 : Numeric type variable carry Data with diamension 1 or 3 or 4
Arg2 : Numeric type variable carry Season starting month
Arg3 : Numeric type variable carry Season ending month
Arg4 : String type variable carry the name of the season

; Compute the seasonal average for user specified seasons.
;
; xMon(time) or xMon(time,lat,lon) or xMon(time,lev,lat,lon)
;
; The input "x" are assumed to contain monthly mean data
; The size of "time" MUST be divisible by 12.
; Also, it is assumed the "Jan" is the 1st month.
;
; first DJF season is a 2-month average (DJF=JF)
;
; USAGE : xSea = season_from_month (xMon, 6, 9, JJAS)
; gives "JJAS : Asian Summer Monsoon Season"
; : xSea = season_from_month (xMon, 10, 12, OND)
; gives "OND : Asian Post-monsoon Season"
; : xSea = season_from_month (xMon, 4, 5, pre-monsoon)
; gives "April-May : Asian Pre-monsoon Season"
;
; RESULT xSea(time/12,lat,lon) or xSea(time/12,lev,lat,lon)
;
; The above would return:
; xSea(time/12,lat,lon) or xSea(time/12,lev,lat,lon)

-- 
*Gibies George,   CSIR-RF,
Climate and Global Modelling Division,
Indian Institute of Tropical Meteorology,
Dr. Homi Bhabha Road,
NCL (P. O.), Pashan,
Pune 411008, India.*
*http://sites.google.com/site/gibiesge/*
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