Refactor for multiple kmodule pkgs; rename pkg

- Rename package to igh-ethercat
- Refactor configure script for multiple kmodule packages
  - Move module files to separet package
- Fixes to rules.in
  - FIXME not quite working
More restructuring of debian/rules

- de-templatize debian/rules
  - grab module package list from debian/control
- add parallel build
- add docs
- .gitignore build artifacts
- add 'binary-arch' target
De-duplicate work done by dh_installmodules