Repair intarray's problems with TOASTed input, avoid scribbling on

source data, improve split algorithm for intbig_ops.  Oleg Bartunov
with some kibitzing from Tom Lane.

contrib/intarray/README.intarray

@@ -10,6 +10,12 @@ All work was done by Teodor Sigaev (teodor@stack.net) and Oleg Bartunov
 (oleg@sai.msu.su). See http://www.sai.msu.su/~megera/postgres/gist
 for additional information.
 
+CHANGES:
+
+March 19, 2001
+   1. Added support for toastable keys
+   2. Improved split algorithm for intbig (selection speedup is about 30%)
+
 INSTALLATION:
 
   gmake

contrib/intarray/expected/_int.out

@@ -8,7 +8,7 @@ CREATE TABLE test__int( a int[] );
 SELECT count(*) from test__int WHERE a && '{23,50}';
  count 
 -------
-   345
+   403
 (1 row)
 
 SELECT count(*) from test__int WHERE a @ '{23,50}';
@@ -21,7 +21,7 @@ CREATE INDEX text_idx on test__int using gist ( a gist__int_ops ) with ( islossy
 SELECT count(*) from test__int WHERE a && '{23,50}';
  count 
 -------
-   345
+   403
 (1 row)
 
 SELECT count(*) from test__int WHERE a @ '{23,50}';
@@ -35,7 +35,7 @@ CREATE INDEX text_idx on test__int using gist ( a gist__intbig_ops ) with ( islo
 SELECT count(*) from test__int WHERE a && '{23,50}';
  count 
 -------
-   345
+   403
 (1 row)
 
 SELECT count(*) from test__int WHERE a @ '{23,50}';