new load/save functions
modified neuron.c load/save functions
Revert "Updated neuron.c"

This reverts commit 91cb1751c42098ff29cd82a129967d88efb00cb4.
fixed line in neuron.c
fixed fprintf in neuron.c
Merge branch 'develop', adds new versions of network_save_to_file and
network_load_from_file, with dimensions checks
TODO.txt created