Needed for curve25519-donna https://github.com/agl/curve25519-donna/issues/31

Fix libtomcrypt/libtommath linking order

more lintings

Fix configure options using AC_ARG_ENABLE

fix indentation

Add .gitignore file

termcodes: make VEOL2, VWERASE, VLNEXT, ECHOCTL, and ECHOKE optional

Change label name _ERR to LBL_ERR

Use DROPBEAR_PATH_DEVNULL instead of undefined _PATH_DEVNULL

in function tcp_acceptor()
  struct sockaddr_storage addr;
  char* addr = NULL;