from elmentary blinking to aimed funcionallity

(photocell with 100k fixed pullup)
no external pullup any more

changed fixed external pullup against switchable internal pullup of A0
(i.e. pin14)
0.4 added "night-detection"

to prevent circuit to be triggered by moving leaves of a tree in front
of the sun (or the like...)
(yes A0 really goes up above 1000)
0.5 changed watchdog initialisation

to an comprehensible register access-sequence and added
BrownOutDetection-disable while asleep
0.6 Morse coded blinking added