(Romance) mv numForms to CommonRomance; rm from Morpho*

[odanoburu]

• removed numForms from Morpho{Fre,Spa,Por}
• added numForms to CommonRomance

notes

• LangPor and LangSpa compile (can't test LangFre on my computer) -- although now we have CI, so I don't have to check anymore, right?
• again my emacs removes all trailing whitespace and makes the diff a mess: you can use git diff --ignore-space-at-eol on the terminal for a cleaner diff
• I wonder how we can prevent this kind of repetition across GF modules... I think something akin to haddock and hoogle would help, though.

[odanoburu]

hum, the build failed because Catalan also uses the Romance functor (are there any other languages that use it? Fre, Spa, Por, Cat, Ita, ...?)

[odanoburu]

I also thought of defining polymorphic versions of numForms and genForms (i.e., numForms : (a:Type) -> a -> a -> Number => a), so that I could define things like:

  genNumForms : Str -> Str -> Str -> Str -> Gender => Number => Str ;
  genNumForms ms fs mp fp = polyGenForms (Number => Str) (numForms ms mp) (numForms fs fp)  ;

is it ok if I do this and submit a PR?