add dummy x descriptions because the x axis gets enlarged so that the amount of datapoints is always a multiple of 5 so add x descriptions even for non-existent datapoints until the amount of x-descriptions is a multiple of 5
add dummy x descriptions because the x axis gets enlarged so that the amount of datapoints is always a multiple of 5
so add x descriptions even for non-existent datapoints until the amount of x-descriptions is a multiple of 5

rework the whole "find the first month" "find the last month" and the walking through all monthly settlements
from this first and last month to use the new php DateTime object.

OlliL/lalaMoneyflow,OlliL/lalaMoneyflow