Deflagify

[levirak]

A branch un-implements the modes as flags (e.g., -keygen became keygen). The way it is done is to let the non-flag arguments float to the end of argv (thanks to getopt), use the first non-flag argument as the mode, and pass an offset integer to all of the setups. This offset tells the setup where that first non-flag argument is, which will always be the mode name (e.g., "keygen"). From there, where the setups previously looked for argv[2] they now look for argv[offset+1].