[ComboTabBar] Fixed isOverflowed() for empty tabbar.

It returned true for empty tabbar. Switching tabs with
mouse wheel now works correctly in all scenarios.
[CommandLineOptions] Change Qt url to qt-project.com
[CommandLineOptions] New option to toggle fullscreen.
[Portable] Portable mode can now be enabled with commandline option

It is not needed to rebuild for Portable mode.
However, it is still possible to enforce portable mode with
PORTABLE_BUILD build option.
[scripts] translations_update now generates transifex friendly ts file

See #1143
[code] Coding style
[SBI_JsIcon] Fix after 36724df3a69

Closes #1174
[AdBlockDialog] Change AdBlockDialog to QWidget

Closes #1169
[AdBlockTreeWidget] Greatly speedup loading rules from subscriptions

Don't use per-pixel scrolling. For some reason, it massively slows
rendering of TreeWidget

See #1169
[DownloadManager] Change "Remove" -> "Remove From List"

Closes #1162
[WindowsJumpList] Add new entry "Open new private window"

Closes #1155
[WebView] Bookmark Link action now uses a.title as bookmark title

Closes #1131
[Translations] Updated translations from Transifex

Also removed incomplete (less than 60%) translations
[Translations] Updated Czech translation
Development version 1.7.0
Updated copyright to 2014
Fixed building
[Translations] Serbian files update
[Translations] Updated array of applicationt translations

Also updated script to also generate application translations
New stable version 1.6.1