RCP: 0.7.6, two lexical table lines with a same label (word form) crashes Specificity method
If a lexical table contains two lines with the same label (same word
form or same lemme, etc.), for example because of manual edition of
lines (eg merging lines), the Specificity calculus crashes.
[feedback from two days TXM workshop in Bordeaux]
Solution
Prevent producing two different lines with a same label in Lines and Columns editing commands.
(from redmine: issue id 1342, created on 2015/05/19 by Serge Heiden)