Some improvements to the Latvian resource grammar

- some missing functions (needed for Phrasebook)
- few bug-fixes (verb paradigms)
- naming, formatting, clean-up

lib/src/latvian/ExtraLav.gf

@@ -8,4 +8,8 @@ flags
 lin
   GenNP np = {s = \\_,_,_ => np.s ! Gen ; d = Def} ;
 
+  --ICompAP ap = {s = \\g,n => "cik" ++ ap.s ! Indef ! g ! n ! Nom } ;
+
+  IAdvAdv adv = {s = "cik" ++ adv.s} ;
+
 }