Very anaemic, needs to descripe the format understood by
hb_feature_from_string() etc., but it is just start.

Allows accepting uniXXXX format.

Fixes https://code.google.com/p/chromium/issues/detail?id=476913

This reverts commit 89cbd4d9.

See discussion:
https://bugzilla.gnome.org/show_bug.cgi?id=747772

Improve hb-shape/hb-view's help text w.r.t. output options 

Not sure we have any right now; motivated by this:
https://bugzilla.gnome.org/show_bug.cgi?id=747772

More ntrospection fixes

Annotate the output parameter.

Fix build on WEC2013

It should not be freed by the caller.

Based on patch from Björn Breitmeyer

This is a tool that lists all fonts that can render a given string.
It uses hb_shape() to do so, and as such is aware of HarfBuzz's
normalizer.

Previously, when creating an object from inert inputs (eg:
"hb_font_create(hb_face_get_empty())") we returned the inert
empty object.  This is not helpful as there are legitimate
usecases to do that.

We now never return the inert object unless allocation failed.

Tests are revised to reflect.

Applies to --font-size and --margin.

Hopefully the scanf usage here doesn't have compatibility issues
(star being counted in the return value, etc).

Part of https://github.com/behdad/harfbuzz/pull/68

Hopefully this results in fewer badly built HarfBuzz integrations.

s/atomic_int/atomic_int_impl/ and s/atomic_ptr/atomic_ptr_impl/
to bring it in par with hb_mutex_impl_t, then re-introduce
hb_atomic_int_t as a wrapper around hb_atomic_int_impl_t.

In hb_reference_count_t, make it clear the non-atomic get and set
are intentional due to nature of the cases they are used in
(comparison to -1 and the debug output/tracing).

Motivated by
https://github.com/behdad/harfbuzz/pull/92

Bug 76494 - #!/usr/bin/python in testsuite

https://bugs.freedesktop.org/show_bug.cgi?id=76494

Make hb_test_tools.py compatible with python 3

On ArchLinux, /usr/bin/python is linked to python 3 so
HarfBuzz `make check` is broken there.

This makes hb_test_tools.py compatible with python 3 while
no breaking it on python 2.

out\debug\hb-buffer-deserialize-text.rl(47) : warning C6001: Using
uninitialized memory 'pos'.