command is a special "hack" used by the drftpd server, but even though it is
  a custom extension I've deemed it fine to add to libcurl since this server
  seems to survive and people keep using it and want libcurl to support
  it. The new libcurl option is named CURLOPT_FTP_USE_PRET, and it is also
  usable from the curl tool with --ftp-pret. Using this option on a server
  that doesn't support this command will make libcurl fail.

receivers, and made the command line tool thus support the option specified
many times

user name

it in smtp.c

sequences in uploaded data. The test server doesn't "decode" escaped dot-lines
but instead test cases must be written to take them into account. Added test
case 803 to verify dot-escaping.

  replaced with equivalent /RTCsu for Visual Studio 2003 and newer versions.

- Compiler option /GX is now replaced with equivalent /EHsc for all versions.

Adjust FreeBSD version check to follow FreeBSD Porter's Handbook

http://www.freebsd.org/doc/en/books/porters-handbook/porting-versions.html

global variables reordering/refactoring/commenting

  headers work correctly even on FreeBSD systems before v8.

end-of-body treatment

doesn't really return any body data to check so I made SMTP check "headers"
as well.

order to re-use 'classic' stopping and allow taking test-suite run time
references from this state.