Editing Release Notes (section)

===Additions and enhancements===

To the reproducible documents collection:

* jsg/lowrank: Seismic wave extrapolation using lowrank symbol approximation (Fomel, Ying, and Song)
* jsg/crs: Non-hyperbolic common reflection surface (Fomel and Kazinnik)
* trip/iwave: Using IWAVE (Symes)
* Viking Graben data moved to the public data server
* sep/fat: Imaging complex structures with first-arrival traveltimes (Bevc)
* sep/helft: Multi-dimensional Fourier transforms in the helical coordinate system (Rickett and Guitton)

To SCons:
* Support for XQuartz on Macs - looking in /opt/X11 directories 
* np= parameter in Flow() for mpi programs
* sfdocs generated for all "pens" in pens/main
* pre-compilation of modules in book/Recipes
* upgraded to scons-2.2.0

To documentation:
* Self-doc is complete now for sfawefd2d and 3d

To APIs:
* python API (m8r or rsf.api) is now always installed
* tell and seek added to C++ API
* added support for FFTW and PSP
* shape() and reshape() methods in File class (python API) reversed for consistency with numpy

To the Python package:
* added support for gnuplot figures in rsf.tex
* added support for sage figures in rsf.tex

To programs:

* sfsemblance: semblance over the specified axis
* sflinear: linear 1-D interpolation
* sfspike now optionally accepts stdin
* iwave package from Bill Symes and The Rice Inversion Project
* user/zone: new contributor (Yanadet Sripanich)
* sfsegyheader creates delrt from o1
* user/poulsonj: new contributor (Jack Poulson)
* vpconvert  checks the existence of different pens and prefers gdpen to pngpen
* sffft1, sffft3, sfspectra, sfspectra2: optional support for FFTW
* oglpen stops movie on pressing 'n' or 'm', menu on left button on Macs
* creating rsfpwd library in user/fomels to avoid code duplication
* sfawefd2d and 3d: constant-density flag. Improved speed, memory
* sfgraph: depth= option for colored symbols
* sfcat and sfadd no longer have a limit on the number of files
* user/chengjb: new contributor (Jiubing Cheng)
* retired su2rsf and segy2rsf to avoid code duplication with suread and segyread
* user/jsun: new contributor (Junzhe Sun)