Update to 2.033

Upstream changes:
2.033    2017-07-06

    - [RT #122371] Remove a couple of improperly-placed weaken statements
      (reported by Phil Perry).

    - [RT #122372] Fix weakening when a page is added to the end of a multiple
      page document (reported by Phil Perry).

    - Fix Bank Gothic core font (reported by Phil Perry).

2.032    2017-07-02

    - PDF::API2 has many circular references, and the end() method doesn't clear
      them all, so memory is leaked.  This release uses Scalar::Util's weaken()
      function to improve garbage collection.  A significant number of circular
      references have been weakened, though many likely still remain.

    - [RT #120756] Eliminate a warning for an ambiguous call to CORE::open
      (first reported by Abdelbaki Brahmia).

    - $text->text_justified() and $text->text_fill_justified() now adjust the
      space between words rather than stretching individual characters in order
      to get the text to fit.

    - [RT #120397] Indirect references and indirect objects can have comments
      embedded in their whitespace, and their object number and generation may
      be split across multiple lines, which may not all be buffered (reported by
      SPROUT).

    - [RT #120450] Fix PDF::API2->open($filename)->stringify() (reported by
      SPROUT).

    - Fix an off-by-one error when calculating text width while charspace is
      non-zero.

    - [RT #120048] Fix PDF::API2->synfont() (broken in 2.029, fixed by Vadim
      Repin) and add basic testing.

(wen)