Finish comment printing functions (configuration settings and print all...

Finish comment printing functions (configuration settings and print all comments with node contents capability). Solve #135089
Add print_insert_link function for use by content writers to position link anywhere in the content. Solves #186216 and (maybe) #180975
Support templates for specific content types and location of templates in both tthe theme directory (checked first) and the module directory. Solves #181458 and #171172