RG and Phrasebook fixes

- added a paradigm for alternative plurals
- fixed usage of alternative plurals in Numerals
- added a distinction between numerals and posessive pronouns
- verb omission and appropriate cases in some uses of to be/to have 
- fixed declination of personal names
- added a gender parameter to pronouns (similar to Polish RG)
- vowel insertion before short adjective suffix
- don't generate short forms for relative adjectives (might need lexicon update)
- minor Phrasebook fixes

lib/src/russian/ExtraRusAbs.gf

@@ -1,3 +1,12 @@
-abstract ExtraRusAbs = {
+abstract ExtraRusAbs = Cat ** {
 
+fun
+
+  have_V3 : V3 ;
+  have2_V3 : V3 ;
+  have_not_V3 : V3; 
+
+  be_V3 : V3 ;
+
+  to2_Prep : Prep ;
 }