***/****starring Lala Sarkissian, Romen Avinian, Ivan Franek, Armen Marouthianscreenplay by Hiner Saleem, Lei Dinety, Pauline Gouzennedirected by Hiner Saleem by Bill Chambers Discombobulating and deadly dull for its initial half-hour, Hiner Saleem's Vodka Lemon coalesces before it's too late into something by no means ineffectual. The first in an accumulation of vignettes finds an old man being schlepped in his bed through the Armenian tundra to a funeral site, where he promptly removes his dentures to pipe a dirge for the other mourners. The picture continues to lightly tread such surreal ground until the whimsical closing shot, in which music…