Add support for piping COPY to/from an external program.

This includes backend "COPY TO/FROM PROGRAM '...'" syntax, and corresponding
psql \copy syntax. Like with reading/writing files, the backend version is
superuser-only, and in the psql version, the program is run in the client.

In the passing, the psql \copy STDIN/STDOUT syntax is subtly changed: if you
the stdin/stdout is quoted, it's now interpreted as a filename. For example,
"\copy foo from 'stdin'" now reads from a file called 'stdin', not from
standard input. Before this, there was no way to specify a filename called
stdin, stdout, pstdin or pstdout.

This creates a new function in pgport, wait_result_to_str(), which can
be used to convert the exit status of a process, as returned by wait(3),
to a human-readable string.

Etsuro Fujita, reviewed by Amit Kapila.

src/bin/psql/stringutils.c

@@ -13,9 +13,6 @@
 #include "stringutils.h"
 
 
-static void strip_quotes(char *source, char quote, char escape, int encoding);
-
-
 /*
  * Replacement for strtok() (a.k.a. poor man's flex)
  *
@@ -239,7 +236,7 @@ strtokx(const char *s,
  *
  * Note that the source string is overwritten in-place.
  */
-static void
+void
 strip_quotes(char *source, char quote, char escape, int encoding)
 {
 	char	   *src;