Fixed the bug in extrapolare_farfield_HRTFs.

Now the handling of the selected x0 is working
Fixed the Umlaut in copyright statement
Merge branch 'master' into vincent

* master:
  Fixed the Umlaut in copyright statement
  Fixed the bug in extrapolare_farfield_HRTFs.

Conflicts:
	SFS_HRTF_extrapolation/extrapolate_farfield_hrtfset_25d.m
	SFS_ir/get_ir.m