Add MSNWeatherPlugin (weatherplugin) thx IPMAN

additionally needed weather-icons in /etc/enigma2/weather_icons_special will be added as depend to original plugin.
Untill then you have to manually download enigma2-plugin-extensions-weatherplugin-weathericonsspecial.zip and place them there.
SEE - http://www.opena.tv/skins/8957-weatherplugin-post74671.html#post74671

In addition you have to install the following packages from feed:
opkg install enigma2-plugin-extensions-weatherplugin
opkg install enigma2-plugin-skincomponents-weathercomponent
opkg install enigma2-plugin-systemplugins-weathercomponenthandler