[NEW][CLOSE] (lisousi): close issue#5 open issue#6

issue#5 is resolved by commit 62436073

issue#6 is newly opened:
Application of the direct-wave transformation by lisousi is not reasonable. It
results in a division by zero. Make the program catch such cases and bail out
with an appropriate error message.

issue5_lisousi_documentation_is_inappropriate.txt

-this is <issue5_lisousi_documentation_is_inappropriate.txt>
-============================================================================
-issue #5: lisousi documentation is inappropriate
-------------------------------------------------
-
- lisousi documentation is inappropriate
-
- The documentation of lisousi in inappropriate in that it does not refer to
- the scientific publications referred to at opentoast. It should give clear
- and unambiguous statements regarding the options required to select the
- standard types of transformations, which are
-
-   direct wave transformation
-   single velocity transformation
-   reflected wave transformation
-   hybrid transformation
-
-references
-
-  http://www.opentoast.de/Data_analysis_code_lisousi.php
-
-  Forbriger, T., Groos, L. and Schäfer, M., 2013. Appropriate line source
-  simulation procedure for shallow seismic field data. 73rd Annual Meeting of
-  the German Geophysical Society (DGG), Leipzig. (poster: front side , rear
-  side)
-
-  T. Forbriger, L. Groos, M. Schäfer, 2014. Line-source simulation for
-  shallow-seismic data. Part 1: theoretical background. Geophys. J. Int.,
-  198(3), 1387-1404. ( doi: 10.1093/gji/ggu199 )
-
-  M. Schäfer, L. Groos, T. Forbriger, T. Bohlen, 2014. Line-source simulation
-  for shallow-seismic data. Part 2: full-waveform inversion — a synthetic 2-D
-  case study. Geophys. J. Int., 198(3), 1405-1418. ( doi: 10.1093/gji/ggu171)
-
-  T. Forbriger, 2003. Inversion of shallow-seismic wavefields: I. Wavefield
-  transformation. Geophys. J. Int., 153, 719-734.
-  (doi:10.1046/j.1365-246X.2003.01929.x)
-
-  T. Forbriger, 2003. Inversion of shallow-seismic wavefields: II. Inferring
-  subsurface properties from wavefield transforms. Geophys. J. Int., 153,
-  735-752. (doi: 10.1046/j.1365-246X.2003.01985.x) 
-
-catch unreasonable parameters
-
-  lisousi should catch cases in which the source to receiver offset vanishes
-
-TODO
-====
-  - test test cases in examples
-    provide a reasonable set
-  - add new test cases in examples
-  - document test cases in examples
-
-  - rework README
-
------ END OF issue5_lisousi_documentation_is_inappropriate.txt ----- 

issue6_lisousi_catch_zero_offset.txt

+this is <issue6_lisousi_catch_zero_offset.txt>
+============================================================================
+issue #6: lisousi: catch zero offset 
+------------------------------------
+
+catch unreasonable parameters
+
+  lisousi should catch cases in which the source to receiver offset vanishes
+
+----- END OF issue6_lisousi_catch_zero_offset.txt -----