Fix failing test pdp-calc1

Fix failing test pdp-calc1

The number of decimal places or the format can be different in the
output depending on the platform.

- The failing test has appeared under msys2 (MINGW32 and MINGW64),
  where the exponential notation has changed:
  E.g. e+000 instead of e+00
- Use DIFF9 also in test pdp-calc1, which reduces the number of
  decimal places to 7 using "%0.7e". See DIFF9 in tests/functions.
- Update the pdp-calc1 output files accordingly
- Fixes failing test pdp-calc1 under msys2