eliminate some warnings of jumping on uninitialized values

if not building in the DEBUG mode, the uninitialised values are not guaranteed to
be zero-valued

valgrind logs available:

==22355== Conditional jump or move depends on uninitialised value(s)
==22355==    at 0x4CBED6: SeafileTrayIcon::setState(SeafileTrayIcon::TrayState,
QString const&) (tray-icon.cpp:234)
==22355==    by 0x4CA742: SeafileTrayIcon::SeafileTrayIcon(QObject*)
(tray-icon.cpp:69)
==22355==    by 0x483951: SeafileApplet::SeafileApplet()
(seafile-applet.cpp:155)
==22355==    by 0x482DA9: main (main.cpp:143)
==22355==
==22355== Conditional jump or move depends on uninitialised value(s)
==22355==    at 0x4D5AFC: LocalRepo::operator==(LocalRepo const&) const
(local-repo.h:47)
==22355==    by 0x4D5B92: LocalRepo::operator!=(LocalRepo const&) const
(local-repo.h:55)
==22355==    by 0x4D4BAA: RepoTreeModel::refreshRepoItem(RepoItem*, void*)
(repo-tree-model.cpp:315)
==22355==    by 0x4D497C: RepoTreeModel::forEachRepoItem(void
(RepoTreeModel::*)(RepoItem*, void*), void*) (repo-tree-model.cpp:284)
Merge pull request #340 from haiwen/eliminate_warnings_of_jumps_on_uninitialized_values

eliminate some warnings of jumping on uninitialized values
Update README.md

Change package name because this one provides QT Linguist in Debian/Ubuntu
prompt a menu for users to choose whether upload a file or create a directory
add initial support for upload directory
pass QByteArray for QHttpPart::setBody because it accepts QByteArray by default
show the uploaded dir correctly after uploading
Merge pull request #345 from 1resu/patch-2

Update README.md
use "folder name"
Merge pull request #344 from haiwen/submenu_mkdir_and_upload

prompt a menu for users to choose whether upload a file or create a dire...
Merge pull request #327 from haiwen/support_upload_by_directory

[RFC] Support upload by directory
small fix of prompt messages
insert the uploaded directory into the front
Merge pull request #346 from haiwen/fix_todo_insert_item

insert the uploaded directory into the front
fix broken style for ubuntu
fix a conflicting shortcut "D"

- "D" is used for delete action
- open and download have the same place and open has a shortcut key "O"
- this will tell download action to use shortcut key "O" as well
Update welcome-dialog.ui

Fixed grammar
Merge pull request #351 from alvonellos/patch-1

Update welcome-dialog.ui
Add new sync error string "Files are locked by other application".
update translations