[FIX] fix uninitialized variable

fix Coverity
fixes 1182336 Uninitialized scalar variable
[FIX] fix memory leak

Coverity fix
fixes 1079516 Resource leak

- add_feature copies the given feature into the vector, therefore the
  caller is responsible for deleting the object created with new
[FIX] fix memory leak

Coverity fix
fixes 1079517 Resource leak

- prevent memory leak by deleting the temporary LCElutionPeak object
todo
todo