Debian packaging operation is moved from  'build-deb-package'  make target to 'deb-package.sh' script

This brings back version number at F1-help screen on all builds. 

Note that now version in c++ code is now defined in a separate file: wcm-version.h. This file is awk-parsed by deb-package.sh to extract version number for debian purposes. Use care when changing this .h file.