[python] adds a background progress dialog
[release] version bump to 13.0 alpha3 as we start new merge window.
fixed: disable slideshow/recursive slideshow buttons in addons listing

closes #10513
fixed: linux package names

closes #13994
[WIN32] fixed typo in bzip2 dependencies.
fixed: selection of correct item after searches

need to strip the options off the videodb items as the
selitem do not have them applied

closes #14054
fixed: avoid spurious dependencies for utils/CharsetConverter.h

from 200 files rebuilt to 56 (144 spurious)
fixed: typos
[WIN32] added download-depends.bat and download-msys.bat to the jenkins build scripts.
[WIN32] fixed: depends also need XBMC_PATH set
[WIN32] added make-xbmc.bat to just build debug or release builds with jenkins.
[jenkins] - bump ios/atv2 builds to default to ios sdk 4.3 which comes with xcode 3.2.6 which is the minimum required version as of our own readme
Merge pull request #2510 from MartijnKaijser/version_april

[release] version bump to 13.0 alpha3 as we start new merge window.
Merge pull request #2484 from nuka1195/DialogProgressBG

[python] adds a background progress dialog