1.0.0  improved the parsing of initial conditions set by simcoal
       further optimized some code.
       added a simulation step with carrying capacity only applied to initial stage in each habitat
       added in the possibility for negative density dependence, where survival of offspring declines closer to mother
0.9.09 added const to take care of CHARSXP changes in 2.6
0.9.07 added documentation comparing kernePop to Rmetasim and EASYPOP
0.12.0 (skipped some changes in intermediate versions, mostly fixing bugs).
       added a vector of potential males to the system to increase speed.
       also added a male choice approximation that somewhat increases speed
       in this version only the male choice approx is implemented.  Will add the
       implementation of the more exact solution in next minor update.
0.12.1 fixed bugs in 'landscape.plot.locations()' and supporting function
0.12.2 numerous changes to pass make check on R3.0
0.12.3 changed a misspelled word in description