whitespace fixes

[Mike Stump <mrs at apple dot com>]

I have some small changes to whitespacing that I'm thinking of  
dropping into the tree.  Roughly speaking, deleting trailing  
whitespace and canonicalizing leading spaces into tabs and continued  
tabbing mid line, if there was already at least one tab.

I'd like to check them in soon as obvious, but due to the timing and  
size, thought I should give a heads up here first.  Scream if you  
have any concerns.

Brief stats:

    4,781 files
    272,699 lines of diffs

I thought it would be better to do this after we forked for the next  
release than before.  I'm thinking it would be better to do it all at  
once, so that people doing merges could merge to the point just  
before, merge it, then merge the rest, if they wanted.  This should  
reduce the any pain for the larger merges (I know about the pain, I  
gotta do a merge myself).

I've audited the work in many different ways (no files with  
upstreams, no generated files, avoided `fixing' the backslash tests,  
audited most all the deleting trailing whitespace changes, audited  
diff -b, audited filenames by extensions or by whole name when there  
was no extension and so on) and should be very, very close to  
perfect, though it isn't inconceivable that there is a fixup that  
should not be.  For example, a non-standard generated file that is  
modified.