This patch removes a bunch of commented-out code, gets rid of code
sitting in #if 0 blocks, and gets rid of #if 1 statements.  It
should have no functional changes.  Some revision-control-averse
comments were removed as well, but they were not the focus of the
patch.

Some comment removal required reformatting of code afterwards
(such as when all code in an else block was defunct, or when a
starting if statement was removed).

With a single exception, no line-internal commented-out code is
handled by this patch to ease review.  In addition, no code that
appears to have a debugging purpose was removed, even if it was
commented out.