1.0.3: --linear option; version/licence info

- Added --linear flag to fdpval and fdcrit that uses linear B
  interpolation between the two nearest dataset B values instead of the
  5-9 nearest points for a quadratic interpolation.
- Added version and licence info to fdpval and fdcrit output
- Added version variables to library (in fracdist/version.hpp, .cpp)
- Removed md5sum check from mn-files.zip download; it broke every time
  the data set download changed (from the recent fracdist.f fixes),
  making the package unbuildable.
- Renamed parse-vals.hpp to cli-common.hpp, and moved some more
  fdpval.cpp/fdcrit.cpp common code into it.