bindings: rename two bindable functions: copytext to copy, uncut to paste

To match the common names used for these functions, for consistency,
and because 'uncut' sounds too much like "undo the cut".

doc/nano.texi

@@ -1140,12 +1140,14 @@ Interactively replaces text within the current buffer.
 @item cut
 Cuts and stores the current line (or the marked region).
 
-@item copytext
+@item copy
 Copies the current line (or the marked region) without deleting it.
+(The old form 'copytext' is deprecated.)
 
-@item uncut
-Copies the currently stored text into the current buffer at the
+@item paste
+Pastes the currently stored text into the current buffer at the
 current cursor position.
+(The old form 'uncut' is deprecated.)
 
 @item cutwordleft
 Cuts from the cursor position to the beginning of the preceding word.

doc/nanorc.5

@@ -487,12 +487,14 @@ Interactively replaces text within the current buffer.
 .B cut
 Cuts and stores the current line (or the marked region).
 .TP
-.B copytext
+.B copy
 Copies the current line (or the marked region) without deleting it.
+(The old form 'copytext' is deprecated.)
 .TP
-.B uncut
-Copies the currently stored text into the current buffer at the
+.B paste
+Pastes the currently stored text into the current buffer at the
 current cursor position.
+(The old form 'uncut' is deprecated.)
 .TP
 .B cutwordleft
 Cuts from the cursor position to the beginning of the preceding word.

src/global.c

@@ -1498,12 +1498,14 @@ sc *strtosc(const char *input)
 		s->func = do_replace;
 	else if (!strcasecmp(input, "cut"))
 		s->func = do_cut_text_void;
-	else if (!strcasecmp(input, "uncut"))
+	else if (!strcasecmp(input, "paste") ||
+			 !strcasecmp(input, "uncut"))  /* Deprecated.  Remove end of 2018. */
 		s->func = do_uncut_text;
 #ifndef NANO_TINY
 	else if (!strcasecmp(input, "cutrestoffile"))
 		s->func = do_cut_till_eof;
-	else if (!strcasecmp(input, "copytext"))
+	else if (!strcasecmp(input, "copy") ||
+			 !strcasecmp(input, "copytext"))  /* Deprecated.  Remove end of 2018. */
 		s->func = do_copy_text;
 	else if (!strcasecmp(input, "mark"))
 		s->func = do_mark;