v0.6.7

• Added ability to use NMproject-specific code completion snippets setup_code_completion().
  Typing new_nm will set up parent object, child will set up child object.

• fixed bug in Windows where R markdown templates weren't being produced.

• fixed minor windows bug where addins were executing models.

• run_nm() checks for psn installation in first use of R session

• clean_tempfiles() replaces clean_run()