Previously random text in the input deck which was not formatted as a
valid keyword header was simply ignored; i.e. this
DIMENS
10 10 10 /
Mohaha random gibbersih - not according to any Spec.
GRID
Would suprisingly parse just fine. This will now be handled according
to the ParseMode::randomText setting. Observe that as a side effect of
this it turned out that many of the test datasets had additional
terminating slashes which were now detected as 'ranomdText'.
