tentative constant file for modularity
implemented promoters flag, and options for getspore()
first implementation of GROW, REPRODUCE and DIVERSITY
updated constant.jl to fit new modularity
bugfix: horizontal gene transfer was not linked to the corresponding parameter in the config file
Corrected the "duplicate" version of reproduce(). This may be optimized.
Also added the "survival" measure for comparison with the c++ code.
added .gitignore for simplicity