CLI: time assignments for filter options

Explanation. There is an important difference between "to <date>" (e.g.
to 15/11/2018)  and "to <date time>" (e.g. to "15/11/2018 13:30"):
<date> is a time span (of 24 hours), while <date time> is a point in
time.

"To <date>" really means "to the end of <date>", while "before <date>"
means "before the beginning of <date>". There are 24 hours between the
two, whereas there is only one second between "before <date time>" and
"to <date time>".  Similar for from/after.

An earlier commit introduced parse_datearg() that only accepts a date
without a time. Hence, a date should be treated as a time span from
midnight to one second before next midnight.

The commit also fixes an error detection bug (filter.start_from/to and
filter.end_from/to were updated too early).

Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

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