Bug#675869: make PDF smaller with version1.4

[Hideki Yamane <henrich@debian.or.jp>]

Hi again,

* Tried to apply PDF size reduction to all texlive-*-doc packages
-> Total:1416.4MB becomes 1024.8MB, 28% reduction.


* All -doc packages have nothing difference with PDF-1.4 and other versions,
  so just convert to PDF-1.4 is enough.

* Compare size with original
-----------------------------------------------------------
texlive-fonts-extra-doc
105M    original
72M     PDF-1.4

-> 32% reduction

texlive-fonts-recommended-doc
3.4M    original
2.8M    PDF-1.4

-> 17%

texlive-latex-base-doc
54M     original
62M     PDF-1.4

-> bigger...

texlive-latex-extra-doc
496M    original
316M    PDF-1.4

-> 36%

texlive-latex-recommended-doc
47M     original
42M     PDF-1.4

-> 10%

texlive-metapost-doc
37M     original
32M     PDF-1.4

-> 13%

texlive-pictures-doc
133M    original
157M    PDF-1.4

-> bigger...

texlive-pstricks-doc
283M    original
200M    PDF-1.4

-> 29%

texlive-publishers-doc
175M    original
120M    PDF-1.4

-> 31%

texlive-science-doc
60M     original
34M     PDF-1.4

-> 46%

texlive-humanities-doc
23M     original
19M     PDF-1.4

-> 17%
-----------------------------------------------------------

* texlive-pictures-doc and texlive-latex-base-doc become
bigger size with PDF-1.4. So we should exclude them.