#11 tff porposes wrong unit per default

[sebastian_busch]

when doing tff, it suggests "ps-1" as unit for I(Q,t):

IDA (3-4) tff

file 3 -> 5 duplicated (297 lines)
Output x coordinate [t] ?
Output x unit [ps] ?
unit of t is "ps"
How many sec is that [1e-12] ?
Output y coordinate ? [Int./I/a] ? Int.
And its unit [ps-1] ? 1

However, I(Q,t) is dimensionless. See Squires, chapter 4.1, p. 62.

[Florian Kargl]

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The correct unit for 'Output x' is either 'psec' for picoseconds
or 'nsec' for nanoseconds depending on whether one is dealing with
time-of-flight data (meV units) or backscattering data (ueV units).
If S(q,w) was chosen as y-axis denominator and 'meV-1' or 'ueV-1' as
y-axis unit the proposed 'Output y coordinate' should be S(q,t) and
should be dimensionless.