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 snippet [codegen.make])
4 - it would really be much nicer if the client lib includes would not depend upon boost serialization
5 i thought a solution would be to provide this optionally by wrapping the corresponding includes in a #ifdef
6 but this does not work since command.hxx is included which depends on boost serialization headers anyway
7 => we do not provide this for now
9 perhaps generated group class should not be prefixed by cmd_group_