Hackers!
I'm proposing to add two new subcommands in psql:
1. \ev viewname - edit view definition with external editor (like \ef for function)
2. \sv viewname - show view definition (like \sf for function, for consistency)
What's inside:
1. review-ready implementation of \ev and \sv psql subcommands for editing and viewing view's definition.
2. psql's doc update with new subcommands description.
3. a bit of extracting common source code parts into separate functions.
4. psql internal help update.
5. tab completion update.
There is one narrow place in this patch: current implementation doesn't support "create" statement formatting for recursive views.
Any comments? Suggestions?
