Fix gnolang#1663

`AssertOriginCall` used to panic on `MsgRun` because it involves more
than 2 frames. But we want to reinforce that property, with an
additional check.

Added an improved version of the unit and txtar tests from gnolang#1048. In
particular, the txtar adds 2 more cases :

19) MsgCall invokes std.AssertOriginCall directly: pass
20) MsgRun invokes std.AssertOriginCall directly: PANIC

Note that 19) involves a change in the AssertOriginCall algorithm,
because in that situation there's only a single frame. Even if there's
no reason to call `std.AssertOriginCall()` directly from the command
line, I think it's logic to make it pass, because that's a origin call.

Co-authored-by: Leon Hudak <33522493+leohhhn@users.noreply.github.com>

Co-authored-by: Leon Hudak <33522493+leohhhn@users.noreply.github.com>

…ssertOriginCall-msgRun