iOS: add AirPrint support
iOS: use bitmap based printing

allows printing of file types other than PDF
Add share icons
Fix iOS formatting.
Tweak Intent usage for ChoosePDFActivity

ChoosePDFActivity can be used either to select PDF/XPS etc files,
or to select key files (for digital signatures). The choice of which
one to use is made according to the action string in the Intent with
which the activity is invoked.

Previously we would look for Intent.action.MAIN and take this to mean
"Look for PDF files", and anything else to mean look for key files.
Unfortunately, if you start the activity directly using adb then the
action string is null, so we look for key files.

The fix is to use a specific (custom) string for key files and for
everything else to be treated as a request for PDF files.
Take on curl change from Sebastian.

This should get us better errors out.
Error out on unsupported encrypted zip files
Handle errors from curl by eventually throwing

Previously errors from curl_easy_perform() were never checked. This
caused mupdf to enter an eternal loop, repeatedly trying to get data
to parse from the remote host.
Fix bug 693580 by skipping xml tag namespace prefixes.

fts_5904.xps and fts_5905.xps use namespace prefixes.

Work around that by ignoring the namespace prefix for tag names.

A more robust solution would be to expand or record the tag and
attribute namespaces in the fz_xml node structure, but that's a
overkill for our current needs.
Fix 692866: improved handling of newlines when copying text.

Only add newlines between selected lines of text.
Fix 692986: add OpenBSD to list of systems that may have .incbin
Fix 693518: update Makerules and debian/control

Debian doesn't have libopenjp2 as a package (whereas gentoo does) so
I've removed it from the control file. You'll need to use the
thirdparty submodule for openjpeg2 until such a time as it exists.
Fix 693391: simplify warning message

Don't print the code point number, to let the inhibition of multiple
identical warnings kick in.
Fix 693419: always load CIDToGIDMap if it exists.

OpenType CFF fonts are detected as TYPE1 by ft_kind.
Relaxing the test for when to load a CIDToGIDMap lets us load
it even for OpenType fonts.
iOS: add support for sharing documents with other apps
iOS: copy files from Inbox to Documents so that they can be altered
iOS: refactor AirPrint code ready for printing at higher res and in strips
iOS: fix AirPrint quality to 300 dpi
iOS: perform rendering for AirPrint in strips
iOS: remove the annotations button for non-interactive document types