Wrong handling of blanks in CCSDS ODM files
According to 6.5.8 in [1] ODM values should convert _ to blanks and
coalesce several blanks into one.
The current parser only trim initial and final blanks.
[1] http://public.ccsds.org/publications/archive/502x0b2c1.pdf
(from redmine: issue id 232, created on 2016-01-25, closed on 2016-02-10)