RTC subsystem

 RTC subsystem. 

 Original RFC available at http://lkml.org/lkml/2005/12/20/220

 Changelog. Between parentheses is the name
 of the person that suggested the change.

 - license and tristate for rtc-lib.c (Andrian Bunk)
 - added driver for ST M48T86

 The following patches have been incorporated:

  none

 The following items are in the TODO:

 - Documentation of exported functions
 - Handling of max_user_freq
 - 11 min ntp update mode

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 Best regards,

 Alessandro Zummo,
  Tower Technologies - Turin, Italy

  http://www.towertech.it

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