-- remove support for LIBT2N_EXPORT_GROUP(group) (this will simplify the generator a lot)
- add option similar to gccs -MD (at the moment it is a fixed set of files generated and
they are handled in the makefile snippet [codegen.make])
- it would really be much nicer if the client lib includes would not depend upon boost serialization
=> we do not provide this for now
- naming scheme?!
perhaps generated group class should not be prefixed by cmd_group_
+- would be nice to reduce amount of changed files
+ (codegen output is often the same as the existing files - something similar to ccache
+ for codegen - but not overwriting output files if they are the same)