[poppler] Poppler 0.42.0 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-0.42.0.tar.xz

Changes against 0.41.0 include:
core:
 * Add the support for version 5 + revision 6 documents. Bug #85368
 * Add initial support for Signature handling
 * Initialize gamut mapping multipliers in ::copy() functions. Bug #90697
 * Implement jpx streams support with depth < 8
 * Handle SMaskInData = 0 for JPX encoded images. Bug #93468
 * Fix rendering of some broken PDF files. Bug #92508
 * PSOutputDev: Support for LZW encoding
 * PSOutputDev: Add support for Flate compression in Level 3 output.
 * SplashOuputDev: Implement function shading. Bug #94441
 * SplashOuputDev: Improve rendering of some non embedded fonts. Bug #94054
 * SplashOuputDev: Fall back to Gfx implementation of tiling pattern if repetition rate is small. Bug #90596
 * SplashOuputDev: Implementation of Matte entries in softmasks of softmasked images. Bug #22473
 * SplashOuputDev: assure line width > 0 in case of text stroke. Bug #94038
 * TextOuputDev: Cache result of inner loop in visitDepthFirst. Bug #77087
 * Avoid attempting a tiling pattern fill with a singular transform matrix

utils:
 * pdfinfo: Add option to show document structure
 * pdfsig: New command that gives information about signature

qt4:
 * Fix bug in links to remote documents getting the page number wrong sometimes

qt5:
 * Fix bug in links to remote documents getting the page number wrong sometimes

This is a *big* release, let's hope we did not break much stuff while adding so many things :)

Testing, patches and bug reports welcome.

Cheers,
  Albert