Checkpoint Chunk: Use a shared W-HTML "chunk" to check login status on all protected pages.

<h1>-Chunk:chCheckpoint</h1>
//If more than 10 minutes elapse before
//this chunk runs, the boolean flag _bLoginOk will 
//be cleared.
(~IfInactiveForSec|600|(~CLEAR|_bLoginOk~)~)
//If _bLoginOK is not defined, then 
//bounce the surfer to the pgLogin page.
//_bLoginOK is set when the TwhLogin component 
//is executed (after the login form posts).
(~REQUIRES|checked._bLoginOk|pgLogin~)
//Otherwise, update the TwhLogin 
//component to make the Usr* properties active.
(~WebLogin.Update~)