add ev log in debug mode

[houqp]

This is used to replay user input so we can reproduce crashes.

[chrox]

Caught one crash.

# now painting {
    ["pageno"] = 118,
    ["excerpt"] = {
        ["y"] = 0,
        ["x"] = 0,
        ["h"] = 1091.1447084233,
        ["w"] = 771.05831533477
    },
    ["size"] = 420732.10033167,
    ["bb"] = 
} {
    ["y"] = 218.13606911447,
    ["x"] = 75.161987041037,
    ["h"] = 781,
    ["w"] = 600
}
# in tap state... {
    ["y"] = 564,
    ["x"] = 497,
    ["timev"] = {
        ["usec"] = 773711,
        ["sec"] = 1361691050
    },
    ["id"] = -1
}
# set up tap timer
lua config error: ./frontend/ui/time.lua:81: attempt to index local 'self' (a nil value)
stack traceback:
    ./frontend/ui/time.lua:81: in function '__add'
    ./frontend/ui/gesturedetector.lua:213: in function 'feedEvent'
    ./frontend/ui/inputevent.lua:405: in function 'waitEvent'
    ./frontend/ui/ui.lua:193: in function 'run'
    ./reader.lua:184: in main chunk

And the ev log is as follows:

3|57|0|1361691048|345158
3|53|497|1361691048|345199
3|54|564|1361691048|345207
0|0|0|1361691048|345212
3|57|-1|1361691048|437846
0|0|0|1361691048|437859
3|57|0|1361691048|886578
3|53|497|1361691048|886618
3|54|564|1361691048|886625
0|0|0|1361691048|886629
3|57|-1|1361691048|958844
0|0|0|1361691048|958881
3|57|0|1361691049|397110
3|53|497|1361691049|397141
3|54|564|1361691049|397145
0|0|0|1361691049|397147
3|57|-1|1361691049|468394
0|0|0|1361691049|468415
3|57|0|1361691049|823944
3|53|497|1361691049|823983
3|54|564|1361691049|823991
0|0|0|1361691049|823994
3|57|-1|1361691049|916387
0|0|0|1361691049|916425
3|57|0|1361691050|368308
3|53|497|1361691050|368338
3|54|564|1361691050|368341
0|0|0|1361691050|368344
3|57|-1|1361691050|368735
0|0|0|1361691050|368738
3|57|-1|1361691050|773690
0|0|0|1361691050|773711

[houqp]

Nice :) I will upload ev replay script tomorrow and see if I can reproduce the crash.

[houqp]

The crash is fixed in new PR. The ev log is really helpful :)