Change tab widget names.

Names for individual tab widgets were not specific and caused warnings
from UIC. Rename the individual widgets to reflect purpose.

[Dirk Hohndel: removed some of the hunks that appeared to be unintentional
               changes not mentioned in the commit log]

Signed-off-by: Amit Chaudhuri <amit.k.chaudhuri@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>