clientParsePlaylist fix

[bazooka07]

Hello,
for clientParsePlaylist() in main/cebclient.c file, I have found 2 issues and more adjustements :

• char port[5] is not enough for a number of 5 digits as the port. char port[6] is required with the null char at end of string
• I think port[j] = 0 is missing
• in serveFile(), if the file is not found, the app sends an 404 error, not 500 error
• By default nb=1 if not found with a setStation request

So, the issues #144 (stream at http://87.118.126.101:19406/stream) and instant with get method are fixed.

[karawin]

Great job, thanks