change unsigned int to size_t
rework on node and net sturctures
tidy up code
set getter and setter for branch length
tidy up code
save changes for tidy up code
tidy up code, found bug hybrid-Lambda -spcu trees/4_tax_sp_nt1_para -o example2 -num 2 -mu 0.00003 -sim_mut_unit -sim_num_mut -mm 1.1 -seed 1410225409
there is probably a bug
tidy up code
tidy up code
debug for rewrite node content
tidy up program
tidy up code
tidy up program
change to inherited classes
tidy up code, use pointers to refer to the parameter species network
add print_newick function, doesn't seem to improve performance though...
debug for newick tree format string
tidy up code