update problem_report for pr-9
add check_time to check delta functions
update the problem_report for pr-8
add update move_worm_along_gline/wline
fix some conflicts
fix some conflicts leftovers in basic_function.f90
add flat histogram and modify the output log file
Merge branch 'master' of https://github.com/kunyuan/DiagMC-time
Add something.