Convert cookie expiration time to GMT time seconds

Usage:

             webpage->cookieT2time("cookie expiration string")

Convert a time value given in the cookie to seconds as given by the system function time(). Expiration time in the cookies are given in the format Wdy, DD-Mon-YY HH:MM:SS GMT

We do not care the Wdy part as this is redundant, and do not care the GMT as that should always be GMT and no other timezone is permitted.

This class method examines the string, splits it into parts and calculates the seconds between January 1, 1970. and the time given by the string.

This is a class method.

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