make the progress dialog larger

Based on FR commit: d7fab57c445a02bf08b90d5cb3ffb44b4b04cdbc
From: Paolo Bacchilega <paobac@src.gnome.org>
make the Compress dialog larger

Based on FR commit: d2b320525916ef554a9f78d99e1687c1ccdadf9e
From: Paolo Bacchilega <paobac@src.gnome.org>
use a boxed type to pass the error to the 'done' signal

Based on FR commit: 4b645f57c856928c508dd74c31e1bfb2132368e1
From: Paolo Bacchilega <paobac@src.gnome.org>
activate compiler warnings

Based on FR commit: 1ceb60e36079e1337aed053b62d327bc2e89fafc
From: Paolo Bacchilega <paobac@src.gnome.org>
fixed compiler warnings

Based on FR commit: 1becb98e4c8bc86feca13b54f991987c4eee3341
From: Paolo Bacchilega <paobac@src.gnome.org>
do not reload the archive if the operation was canceled

Based on FR commit: fce07b555afa34a17ce7faf6c7936915a3bf250b
From: Paolo Bacchilega <paobac@src.gnome.org>
removed the sidepane title

Based on FR commit: 55a12cb2adfc818b5b659cbcf003e80a7fc89da8
From: Paolo Bacchilega <paobac@src.gnome.org>
Update POTFILES.in
enable interactive search in the file list

Based on FR commit: 574906a243f7bb8b2b63654d9b0be91fe2bcf738
From: Paolo Bacchilega <paobac@src.gnome.org>
do not update if the progress dialog is null

Based on FR commit: be63c259099367a73332be59b5bcee4d0c6519f1
From: Paolo Bacchilega <paobac@src.gnome.org>