It's often not obvious how option constants relate to numerical values.
Defaults are sometimes printed as numbers and from/to are always printed as numbers.
Printing the numeric values of options constants avoids this confusion.
It also allows to see which constants are equivalent.

Before this patch:

  -segment_list_type <int>        E........ set the segment list type (from -1 to 4) (default -1)
     flat                         E........ flat format
     csv                          E........ csv format
     ext                          E........ extended format
     ffconcat                     E........ ffconcat format
     m3u8                         E........ M3U8 format
     hls                          E........ Apple HTTP Live Streaming compatible

Afterwards:

  -segment_list_type <int>        E........ set the segment list type (from -1 to 4) (default -1)
     flat            0            E........ flat format
     csv             1            E........ csv format
     ext             3            E........ extended format
     ffconcat        4            E........ ffconcat format
     m3u8            2            E........ M3U8 format
     hls             2            E........ Apple HTTP Live Streaming compatible
Signed-off-by: softworkz <softworkz@hotmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>