Added alias "--run" for "--execute", more consistent with "nuitka-run" name.
Windows: Fix output for DLL loading with --python-flag=-v
Cleanup constants loading

* Don't use stream_data define, when debugging I wasn't so sure it
  couldn't corrupt things
Windows: Make sure we build paths with proper separator

* Even if it works to use SEP = "/" as provided by Python, it looks
  ugly in traces.
Minor comment correction

* The meta path loading is the only hook we do now, and so "also" is not
  correct.
New stable release.
Merge branch 'release/0.5.1'
Merge tag '0.5.1' into develop
New release cycle.
Fix, need to make Scons aware of dependencies to files, otherwise caching breaks.
New hotfix release.
Merge branch 'hotfix/0.5.1.1'
Merge tag '0.5.1.1' into develop