Update TODO with lost change, mostly completed items and whitespace

corrections.  Not sure why these were not in CVS.  Researching.

doc/TODO

 PostgreSQL TODO List
 ====================
 Current maintainer:	Bruce Momjian (bruce@momjian.us)
-Last updated:		Wed Aug  1 19:13:20 EDT 2007
+Last updated:		Mon Aug 27 22:56:24 EDT 2007
 
 The most recent version of this document can be viewed at
 http://www.postgresql.org/docs/faqs.TODO.html.
@@ -171,11 +171,7 @@ Administration
 Monitoring
 ==========
 
-* Allow server log information to be output as INSERT statements
-
-  This would allow server log information to be easily loaded into
-  a database for analysis.
-
+* -Allow server log information to be output as CSV format
 * -Add ability to monitor the use of temporary sort files
 
 
@@ -1137,6 +1133,13 @@ Cache Usage
   accessed bitmaps would have to be stored in shared memory.  One 8k
   page of bitmaps could track 512MB of heap pages.
 
+  A third idea would be for a heap scan to check if all rows are visible
+  and if so set a per-table flag which can be checked by index scans. 
+  Any change to the table would have to clear the flag.  To detect
+  changes during the heap scan a counter could be set at the start and
+  checked at the end --- if it is the same, the table has not been
+  modified --- any table change would increment the counter.
+
 * Consider automatic caching of statements at various levels:
 
 	o Parsed query tree
@@ -1221,6 +1224,11 @@ Vacuum
 
   http://archives.postgresql.org/pgsql-patches/2007-03/msg00358.php
 
+* Reduce XID consumption of read-only queries
+
+   http://archives.postgresql.org/pgsql-hackers/2007-08/msg00516.php
+
+
 * Auto-vacuum
 
 	o Use free-space map information to guide refilling