If a string type's default value has quotes in it, we have to escape
those quotes when inserting it into other strings.
The __config_process_value() function can change the type of a value
(ITEM_ID types get reset to ITEM_NUM).  For that reason, only call it
on the final value, not on every intermediate value.

__wt_config_getraw() can be static to this file, rename it and make
it static.
Add a new server thread that can be configured to periodically output
statistics to a file.
Gcc with -Wformat-nonliteral complains about a pair of strftime calls
because they don't get called with string literals.  I can't think of
any way to turn off the complaint, add comments so people don't waste
time.
Merge branch 'develop' into statistics-log
update
Support multiple files.
If we're eating multiple files, the entries aren't in order and gnuplot
doesn't sort them -- sort on the leading timestamp.
Reference stat logging from the tuning page.
I can't use "wtsl" as the stat file name, it's not in our name space;
use WiredTigerStat instead, scoring serious StudCap points.
Minor page title change.
Merge pull request #459 from wiredtiger/statistics-log

Add support for periodically logging statistics to a file and a tool to generate graphs based on those logs.