pcvs log view not functional

[finalpatch]

Hi, all

i just found that the logview window created from pressing "l" in a pcvs
buffer is a bit different from the logview window you get from "C-x v l" in
a source file buffer. all the functions (such as diff, annotate, find
version) in the logview menu doesnt work in the pcvs logview. it's as if the
logview is not linked to the file and logview-mode cannot do anything with
it.

-- 
Feng Li