update todo

done.txt

@@ -16,3 +16,4 @@ x 2016-01-24 clear delimitation of public API
 x 2016-01-24 document coordinate conventions                                         @documentation +v1.0
 x 2016-01-24 move parameters from _fluid_particle_base to NavierStokes etc           @design
 x 2016-01-29 install_info should be renamed to bfps_info in data file
+x 2016-02-01 tweak HDF5 settings                                                     @optimization @HDF5 +I/O

todo.txt

 (B) compute z polynomials only when needed                                  @optimization
 (B) read https://www.xsede.org/documents/271087/369161/ExtScale-Koziol.pdf  @optimization @HDF5 +I/O
 (B) set up mechanism for adding in new PDEs                                 @design +v2.0 +alternate_algorithms
-(B) tweak HDF5 settings                                                     @optimization @HDF5 +I/O
 (B) use less memory                                                         @optimization
 (C) code overview                                                           @documentation
 (C) move stat I/O to cpp lib                                                @design @HDF5