Review the padding of 'file' field

[anouvel]

Pad this line :

[ 2016/05/01 14:34:10 ] [ INFO ] (l. 44) lem_parse_input.c -> new line : 2-3

to (spaces are changed by '_' here) :

[ 2016/05/01 14:38:30 ] [ INFO ] (l. 44) lem_parse_input.c___________-> new line : 2-3

with the printf padding flag :

printf("%-30s\n", "hello");

[jgigault]

I was wondering something like this in the subway that night..