VITESS 2.4
----------

Due to changes and improvements in the module 'source', 'guide', 'chopper_fermi', 
etc. (see below), exactly the same result as by Vitess 2.3 cannot be expected. 
Nevertheless, the changes should only cause statistical deviations - except for 
simulations of instruments with guides in the very long wavelength range (above 
30 Ang) calculated with gravity.


New MODULES are:
----------------

'sample_singcryst'
 ----------------
This module simulates a single crystal sample.



New features in MODULES
-----------------------

'source'
 ------
- The specification of neutron sources with up to 2 moderators has been introduced.
- An intensity distribution file I(lambda,t) as a function of time and wavelength
  can be read for pulsed sources.
- The divergence of the neutrons can be defined by the 'propagation window'
- The order of MC choices is changed. Now a separate window after the source should 
  give the same result as putting the same window into the 'propagation' part of
  the source module.

'chopper_disc'
 ------------
- The chopper center can now be positioned beside the guide (instead of above or below it).
- The chopper can set the time to zero.

'monitor'
 -------
- An option is included to normalize the data with binsize
- Standard deviations per bins are written out as third column 

'guide'
 -----
- The first and the last segment of a bended guide are aligned to the preceding
  or following resp. component
- Additinal check, if trajectories end out of the guide exit area
  (loss of trajectories by waviness and gravity is prevented)

'bender'
 ------
- Greater number of possible channels

'sm-ensemble'
 -----------
- Visualisation



Improved or corrected modules
-----------------------------
'chopper_fermi'
'detector'
'sample_powder'
'sample_reflectom'
'eval_inelast'



New TOOLS are:
--------------

Visualise Vitess output files with IDL / PV-Wave
(see rvitess.pro)

'Generate Surface Files'
 ----------------------
Helps to generate the surface file for the bender module.
The bender may consist of thin layers.



Improved TOOLS
--------------
'Generate Batches'
- number of possible variables, simulations etc. increased