STDIN related fixes

- fixed https://rt.cpan.org/Ticket/Display.html?id=155578: adding a
new entry from STDIN now works regardless of interactive seting.

- added new flag -n

- fixed note number argument

- code reorganized

note.pod

@@ -32,6 +32,9 @@ by the pwsafe3 backend, which is encrypted by default.
 
 Use another config file than the default ~/.noterc.
 
+=item I<-n, --new>
+
+Create a new note entry.
 
 =item I<-l, --list [topic]>