[poppler] Poppler 0.16.4 released

[Albert Astals Cid]

Available from
http://poppler.freedesktop.org/poppler-0.16.4.tar.gz

Changes against the 0.16.3 release:
core:
 * Small improvements in Annot parsing

glib:
 * Add g_return macros to make sure index is correct in form field choice 
methods
 * Fix a crash when a choice form field has no items selected in glib-demo

utils:
 * Small fixes to the pdftohtml manpage
 * Fix copyright years

qt4:
 * Fix caption of push button fields

Testing, patches and bug reports welcome.

Albert