Checks whether the input for crossover is given
correctly. If not, a message is prompted which asks to input one of the 2
available crossover methods. The available inputs are "E" and "R". "E"
refers to partitioning at equal intervals and "R" refers to random
partitioning.
readinteger()Returns the selected crossover method (character)
Other Helper Functions:
get_grids(),
grid_area(),
hexa_area(),
isSpatial(),
permutations(),
readintegerSel(),
splitAt(),
windata_format()