More improvements to the Latvian resource grammar (motivated by PhrasebookLav)

- Few bug-fixes (agreement between Pron and ComplAP; C1 verb paradigm; how8much_IAdv / how8many_IDet).
- Differentiation between male and female pronouns.
- Irregular verbs now can have prefixes.
- Code refactoring.

lib/src/latvian/ExtraLavAbs.gf

@@ -1,3 +1,14 @@
 --# -path=.:../abstract:../common:../prelude
 
-abstract ExtraLavAbs = Extra ** {}
+abstract ExtraLavAbs = Extra ** {
+  fun
+    to8uz_Prep : Prep ;  -- "to" in the sense of "uz" (direction)
+
+    i8fem_Pron : Pron ;
+    we8fem_Pron : Pron ;
+    youSg8fem_Pron : Pron ;
+    youPol8fem_Pron : Pron ;
+    youPl8fem_Pron : Pron ;
+    they8fem_Pron : Pron ;
+    it8fem_Pron : Pron ;
+}