Prelim branch

run ./population.out -i file_name to work with some initial distribution of massive star from the file_name.
to generate such file run  ./population.out -g file_name 
Classical pulsar population can be run by ./population.out -f

The status of program.
It is preliminary. Now I used only one model of magnetic field decay (I am going to implement other as soon as possible) and only one model of luminosity. 

Known issue: have read 400000 lines of some file with data about massive stars program is crashed with error:
STOP: loop limit exceed. I do not know how to deal with this error

I also expect that file of initial position of newly-born NS for advanced synthesis (5e8 years) will be about 200-250 Mb. The run on timescale 1e8 produces file of 60 Mb