update todo files, bug is 'fixed'

[libt2n] / codegen / TODO

- 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])

open questions:
- should projects using the codegen depend on installed version of ... or ship their own version?
- get rid of codegen-stubhead.hxx or include a "copy" in each project?
  first we said yes but now i say no because the lib depends on the libt2n headers anyway
- makefile snippet must work for builds outside of libt2n
  => some variables must be set by configure
  the variables which must be set:
	LIBT2N_CODEGEN="\$(top_builddir)/codegen/libt2n-codegen"
	LIBT2N_CLIENT_PCTEMPLATE="\$(top_srcdir)/codegen/clientlib.pc.in"
	LIBT2N_CODEGEN_MAKESNIPPET="include \$(top_srcdir)/codegen/codegen.make"

  we store the variables in the .pc file of libt2n
  maybe wrap the calls to pkg-config in a m4 macro
  (=> projects using libt2n-codegen need only one line in configure.in)

- it would really be much nicer if the client lib includes would not depend upon boost serialization
  i thought a solution would be to provide this optionally by wrapping the corresponding includes in a #ifdef
  but this does not work since command.hxx is included which depends on boost serialization headers anyway
  => we do not provide this for now