libmid: minor cleanup
libanalyze: THE SKYLINE FUNCTION IS TOTALLY BROKEN....

Why was onset and offset only set to a uint8_t..... This simply cannot
work!

I don't know if changing these vars into doubles acually helps...

Please give feedback.
libanalyze: remove wasteful constant expression
midiogre: fix illigal memory access
midiogre: fix song_row_new