Log Message:
Update to 0.5.6. From the changelog:

- fixed compilation problem, bug #2785683
- fixed critical bug with overlap splitpoints not working (feature
    #1530782 => bug)
- fixed critical bug with mp3 stdin (& framemode)
- fixed bug #2786300 in plugins compilation (added -lm)
- Xing header is now written even if SPLT_NO_TAGS option is used
- added SPLT_OPT_XING option to not write Xing header
- fixed bug with custom tags and multiple usages of @o
- fixed bug with stdin & id3v2 & xing
- fixed a small bug with genre in custom tags
- fixed some warning messages & added some more
- fixed dewrap error message
- fixed dewrap bug to not attempt to create output directories when
    '-d' option is used
- fixed minor bug #2790952 : time mode creating an empty file (at the end)
- fixed issue with CUE file not being imported correctly : \r and
    \n problem (bug #2778717)
- fixed bug #2691576 - CUE file seg fault if no artist
- fixed bug #2520183 : wrong size in snprintf call
- fixed bug with ID3v1 and '@N' (was 1,3,5,... instead of 1,2,3,...)
- fixed time split with '0.0' was infinite looping
- fixed empty output format '' seg fault
- added options @m,@M,@s,@S,@H,@h + no @h or @H in output filenames
    if hundreths are 0
- added --with-(mad|id3)(-libraries|-includes)?, --disable-[mad|id3]test
    configure options
- added overlapping option of split files (feature request #1530782)