I miss A0-An definitions for analog pins

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I miss A0-An definitions for analog pins.

When i want to set analog pins to in/out or doing digital write/read i have to 
calculate the pin number, so i added some definitions to arduino_lit.h, i don't 
know if this is the proper way/file to do it, but works for me:

#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
    #define A0  54
    #define A1  55
    #define A2  56
    #define A3  57
    #define A4  58
    #define A5  59
    #define A6  60
    #define A7  61
    #define A8  62
    #define A9  63
    #define A10 64
    #define A11 65
    #define A12 66
    #define A13 67
    #define A14 68
    #define A15 69
#else
    #define A0  14
    #define A1  15
    #define A2  16
    #define A3  17
    #define A4  18
    #define A5  19
    #define A6  20
    #define A7  21
#endif

Original issue reported on code.google.com by santig...@gmail.com on 13 Apr 2012 at 1:24