renaming of functions to be more descriptive

main
- added some lines for when user wants to use either 3rd or 4th test

STDS
- added comments in head
- changed function calls to new names
- changed output of StDev/MedianAppend to not have any blanks

SpeedTestFile
- changed some function names and variable names
- working on convert_to_2d function

TCP_Test, UDP_Test, Ping_Test
- comments for functions
- optimization of other functions (reducing redundancy)

added CSV file for 3rd field test, renamed 4th field test CSV