epgview: rework hasFollowScreenings() and FollowScreenings()

the current code has differences in hasFollowScreenings() and
FollowScreenings() leading to different results. hasFollow() returns
true but Follow() then notices that there are actually no repeats.
Fix this by making hasFollowScreenings() generate a list "followlist"
containing all repeats and FollowScreenings() use that list.
An added benefit is that the requested feature to add a possibility to
select one of the follow-ups for a record timer will be also able to
use that list ;-)

git-svn-id: file:///home/bas/coolstream_public_svn/THIRDPARTY/applications/neutrino-experimental@1383 e54a6e83-5905-42d5-8d5c-058d10e6a962


Origin commit data
------------------
Commit: 90164158b3
Author: Stefan Seyfried <seife@tuxbox-git.slipkontur.de>
Date: 2011-04-10 (Sun, 10 Apr 2011)

src/gui/epgview.h

@@ -54,6 +54,7 @@ class CEpgData
 	private:
 		CFrameBuffer		*frameBuffer;
 		CChannelEventList	evtlist;
+		CChannelEventList	followlist;
 		CEPGData		epgData;
 
 		std::string 		epg_date;