[HierarchicalGenePool]: Fixed typo in toString()
[HierarchicalGenePool]: Fixed typo in toString()

Noticed that toString() in HierarchicalGenePool wasn't including a space
before listing the fitness, causing it to be appended directly to the genome.
Fixed this so it's properly whitespaced.

Signed-off-by: Sebastian Lenartowicz <82628b08c690d7b843f293282c58895740bc10b7@uoguelph.ca>

NGTOne/libHierGA