Unify Discretize and Continuize

[ajdapretnar]

Discretize and Continuize have different wording for default. Judging by the outdated documentation, Continuize used to say "Default setting: leave". Discretize has "Default setting: keep", which is already inconsistent. However, Continuize now has "Preset: no change". It would be nice to have this streamlined.

[janezd]

• Discretize show "Keep categorical" and Continuize shows "Keep numeric". This is already OK.
• There is a small inconsistency in the short forms -- "Keep as is" (Discretize) vs. "Keep" (Continuize). We can fix this.
• "No change" is different. The former two are about changing the variable type while this one is about scaling. It would keep this "No change" as it is, without changes. :)

[ajdapretnar]

This is not what I had in mind. I was referring to the below part. Discretize says "Default setting: keep", while Continuize says "Preset: no change". I would prefer having the same phrase in both, which ever one we choose.

[janezd]

Ah, I, see. Also note that individual variables without specific setting in Discretize are marked by (default), while in Continuize they are not.

• I (it was probably me) probably used different two different words because I liked neither. :) "Default setting" sounds too much like a widget default, and "Preset" is ... something I probably invented to avoid "Default". I think I prefer "Default", but if we can think of something better...
• As for (default) in the list view, I think I like it so I'd add it to Continuize.