Added support for the SOFA crippled export mode --

a mode, in which T000 shape files (cell, nucl* masks) are read
but (only) chromatin and deformation magnitures are generated new.

The purpose of this mode is to create and export ``new'' cells without
the need to re-mesh them in the SOFA. That's why the mask/shape stuff
is re-read while all the rest is created new.

M    ISBI2015/config-smallVOI-lowSNR.ini
M    src/cell.cpp