Add stricter syntax checking to io_load_*()

Be more restrictive with what we allow in data files and bail out if a
line doesn't conform to our specification, especially in regard to
separators. This prevents unexpected behavior when a data file is edited
manually. As a bonus, this fixes a whole pile of compiler warnings
previously seen with "-Wunused-result".

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

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