Solve the error "unicode server permits only ..."

Encountered the error "unicode server permits only unicode enabled clients".
Set Charset to solve it.
Fix init_rev_view()

If rev_view_cur can be in the middle of the view window,
set rev_view_first = 0.

Signed-off-by: hwangcc <hwangcc@csie.nctu.edu.tw>
Send the p4 command to get revisions

1. Run the command 'labels' to get revisions.
2. Use a vector to store returned labels

Signed-off-by: hwangcc <hwangcc@csie.nctu.edu.tw>