all
- made globals in parcel.cpp/h start with g_ to better identify
- replaced deprecated bzeros with memsets (pedantic, I know)
- added string in verb headers so that line can self identify which function it's printing from (should probably move into verb, but having to pass the string every time anyway means it just removes the ability not to print function name)

parcel.cpp
- added ability to print out a backtrace on a segfault
- unified remote_to_local and local_to_remote into a start_transfer function (still needs more debugging)
- removed argument from run_ssh_command, and just check length instead (what's passed is a global, and function was accessing the same global struct all over inside)
- added preliminary ability to have program spit out a log file, which will find a place to write depending on send/receive case (easier to debug remote problems)