#371 Seek preferences too artificially limited

[Einar Lielmanis]

In preferences - interface - seeking the "medium jump" and "long jump" are too limited, and won't allow specifying time less than 1 minute for no good reason whatsoever. E.g - there is no way to use a minor 3 sec jump for the "short jump" (essentially used for tiny rewinds), and a larger - 30 sec one for longer small-jumps.

smplayer 0.6.9 under 64-bit arch linux.