remove unneccessary const
add forgotten placeholder slate emptyslate
improve build of slates, implement major parts of testbackend
rework Makefilesystem
refine makefile system
ignore m4 dir
try to fix problem, remove unneccessary files
fix makefilesystem, fix build with testbackend
fix generation of m4 macros, ease gtkmmbackend.h, some magic killed
build again
autotools: finally really fix the problem: AC_DEFINE just defines a C
variable