Added support for skipping DLNA index entries that have out-of-range time/byte offset values

Converting DLNA index files O-AAC_ADTS_320-stereo-44kHz-96k_indx.txt and
 O-MP2TS_SN_I-4_indx.txt (the two files with known out-of-range byte
 offsets) now produce sane index files.