Open

+ Display the current case mode (^C) onscreen

+ emacs like key bindings
    ^S for searching (^Y)
    Up/dwn Arrow support Next/Prev field. ??
    Inline editing on Input fields ( ??^B/^F )
    ^X^C to quit ( ^Q ??)
    Pagdwn/PageUp/+/- 

+ Same capabilities as interactive in non interactive (one shot) mode

+ Provide some how-do-I-use-this-thing doc.

+ Replace invlib.[ch] by real database.  Failing that, at least sanitize it.

Possible changes:

? Change to full screen target display and use bottom line for command,
    control or fn keys for operations (cf pine)

? Apply added capability from osr5 codebase

