added the management command lang_copy to copy the whole content from one lang to another
now also copies pages attributes unless --skipattrs is given +  better help
Rework lang_copy command as cms subcommand
Use sys.stdout instead of print
Fix languages checks
Remove --skipattrs option: a Title must exists to really copy content from language to another
Add copy_plugins_to_language api function
Documentation for copy_plugins_to_language and get_page_draft in the API document. Minor documentation cleanup
Rework copy-lang command to use the cms.api function
Add tests for copy-lang command
Add documentation for copy-lang command
Merge pull request #2191 from yakky/feature/lang_copy

Add copy-lang command