Re: insetindex patch

[Angus Leeming]

JMarc> I think that, while the restriction makes sense for
JMarc> LFUN_INDEX_CREATE_LAST, it does not for insert-index, especially since
JMarc> there is no error message. Inserting an empty index entry would make
JMarc> more sense.

Fix made (but not attached!). However I think that we should remove the 
"insert entry of last word" menu option and corresponding LFUN_INDEX_CREATE_LAST. 
The code already does this for "insert entry", LFUN_INDEX_CREATE.

Shall I remove it?
Angus