Delete POWER.txt

diff --git a/docs/POWER.txt b/docs/POWER.txt
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-Time to Sleep
-=============
-USB suspend     no activity on USB line for  3ms
-No Interaction  no user interaction
-    matrix has no change
-    matrix has no switch on
-
-
-AVR Power Management
-====================
-
-V-USB suspend
-    USB suspend
-    http://vusb.wikidot.com/examples
-
-MCUSR   MCU Status Register
-    WDRF    Watchdog Reset Flag
-    BORF
-    EXTRF
-    PORF    Power-on Reset Flag
-
-SMCR    Sleep Mode Control Register
-    SE      Sleep Enable
-    SM2:0   
-        #define set_sleep_mode(mode) \
-        #define SLEEP_MODE_IDLE         (0)
-        #define SLEEP_MODE_ADC          _BV(SM0)
-        #define SLEEP_MODE_PWR_DOWN     _BV(SM1)
-        #define SLEEP_MODE_PWR_SAVE     (_BV(SM0) | _BV(SM1))
-        #define SLEEP_MODE_STANDBY      (_BV(SM1) | _BV(SM2))
-        #define SLEEP_MODE_EXT_STANDBY  (_BV(SM0) | _BV(SM1) | _BV(SM2))
-
-
-ACSR    Analog Comparator Control and Status Register
-    To disable Analog Comparator
-    ACSR = 0x80;
-    or
-    ACSR &= ~_BV(ACIE);
-    ACSR |= _BV(ACD);
-
-    ACD: Analog Comparator Disable
-        When this bit is written logic one, the power to the Analog Comparator is
-        switched off. This bit can be set at any time to turn off the Analog
-        Comparator. This will reduce power consumption in Active and Idle mode.
-        When changing the ACD bit, the Analog Comparator Interrupt must be disabled
-        by clearing the ACIE bit in ACSR. Otherwise an interrupt can occur when
-        the bit is changed.
-
-DIDR1   Digital Input Disable Register 1
-    AIN1D
-    AIN0D
-        When this bit is written logic one, the digital input buffer on the AIN1/0 pin is disabled. The corresponding PIN Register bit will always read as zero when this bit is set. When an analog signal is applied to the AIN1/0 pin and the digital input from this pin is not needed, this bit should be written logic one to reduce power consumption in the digital input buffer.
-
-
-PRR     Power Reduction Register
-    PRTWI
-    PRTIM2
-    PRTIM0
-    PRTIM1
-    PRSPI
-    PRUSART0
-    PRADC