Commit [5ca7aa] Maximize Restore History

Clarified indentation issues in Book::PP and #line directives

If there are any spaces leading the #line directives, they will not
be processed correctly by Perl. I encourage copy-and-pasting the text
from the examples and have notes about necessary corrections for
__END__ and __Pdlpp__, so I added a new note for #line directives.

David Mertens David Mertens 2012-01-31

changed PDL/Book/PP.pod
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