1 - remove support for LIBT2N_EXPORT_GROUP(group) (this will simplify the generator a lot)
2 - add option similar to gccs -MD (at the moment it is a fixed set of files generated and
3 they are handled in the makefile)
6 - should projects using the codegen depend on installed version of ... or ship their own version?
10 - get rid of codegen-stubhead.hxx or include a "copy" in each project
11 - makefile snippet must work for builds outside of libt2n
12 (=> some variables must be set by configure, the snippet must be installed
13 => pc file template must be installed, too)