[mandelbrot] skipped unnecessary and costly reinitialization of initial conditions in AMR setup
[cg_level_connected] expanding an array one-by-one with LHS-realloc is pretty inefficient. Switched to doubling size of the growing array
Merge pull request #98 from gawrysz/optimizations

[mandelbrot] skipped unnecessary and costly reinitialization of initial conditions in AMR setup