added concat function and some parameter in payload in structure
some hash define added which are used in multiple file
concatenated pmt packets
concate pmt packet
Merge branch 'pr/n49_anshul1912'
Fix for mp4

Fixed the wrong subtitles on the given iphone sample by splitting up the
sample into multiple atoms (if present) instead of just one. Tested
change with a second (already working) sample, nothing broke there.
Added a description of fix in changes.txt
Merge branch 'pr/n51_wforums'