install/user.sh: Install all bin/*

Use a for loop to link all files in bin/ instead of having to add a line
to install/user.sh for each file added.
Add more scripts to bin:

  - convert_unixtime.pl: Converts unix timestamp to human readable date
  - convertsecs: Converts time in seconds to hours:minutes:seconds
  - ip_in_range.py: Checks if IP address is in a range