Addquotes: add option to ignore / force exact match

[remimorvan]

In the file defining the knowledges, add the possibility of writing keywords (in comments) in the same line as the definition of some knowledge kl to desactivate some features of the addquotes command, such as:

Keyword	Effect
kl-addquotes:ignore	do not propose to the user to add quotes around occurrences of kl
kl-addquotes:force-exact-match	do not propose to define synonyms of kl
kl-addquotes:only-case-insensitive	proposes to define kl' as a synonym of kl only when kl' is the same as kl, up to letter case

For every keyword kwd, add a keyword kwd-syn which has the effect of applying the effect of kwd to kl but also to all its synonyms. Add a keyword kwd-all to apply this effect to every knowledge of the file.

[remimorvan]

This is far from being a priority…

[LeonPyramid]

Might get useful, if you use single letter for definition, you get proposition of synonyms for every word containing this letter!