Also set ACLOCAL_AMFLAGS in the top-level Makefile.am and update
the .gitignore file in the m4macros directory. This fixes the build
from a fresh checkout for me. Please revert if it causes problems.
Depend on the libpng version that is in debian testing (1.2.42) and
use png_set_expand_gray_1_2_4_to_8() instead of the deprecated
png_set_gray_1_2_4_to_8().
To give us experience with Glade + GtkBuilder, use it for the save
dialog in the PNG plug-in. The layout is as good as
identical. Mnemonics still works and strings are still translated.
Bump required GTK+ version to 2.18.1 so we get
e.g. gtk_widget_set_visible() and offscreen widget hierarchies. So far
we don't rely on bug fixes in any later releases.
Enable us to have regression testing by introducing a core testing
framework that uses the GLib JUnit-like test library.
Do this by adding a new subdir app/tests that will contain all our
tests (it contains one trivial test already). Also add app/tests.[ch]
with a new function gimp_init_for_testing() so that test cases can
easily setup the core object system.
Enable silent build rules by default, requires at least
Automake-1.11. Disable by either passing --disable-silent-rules to
configure or passing V=1 to make.