Object cleanup (#307)

Object cleanup (#307)

* elminiate some early program exits.

exits without cleanup make it harder to find memory leaks.

fix a few leaks.

enhance random format to support reading real time position data.

correct some sign related warnings.

* use invariant generator for random format.

* make compilers happy with random.

clang doesn't like:
  random.cc:61:42: note: read of non-constexpr variable 'generator' is not allowed in a constant expression
    constexpr double scalefactor = 1.0 / (*generator).max();

msvc doesn't like:
  warning C4100: 'fname': unreferenced formal parameter

* catch main.cc up with master manually.