v7.4.19

Okay, I am trying to fix up the version number to be the version here on github. I am still do not get the hang of github down yet... Subversion, yes... git... no...

Changes include:

Thanks to Yubo Su for the patch that adds 'f, F, V, and v' commands.
With this change, the original 'f' command was remapped to 'a'.

The set of commands that can be used during exploring are:
F - Open selected buffer in another window above the current.
f - Open selected buffer in another window below the current.
V - Open the selected buffer in another window on the left of the
    current.
v - Open the selected buffer in another window on the right of the
    current.