Reintroduce missing multiplication of staple with smearing coefficient.
Add coefficient multiplication to HEX smearing.
Refactor code between HEX and Stout.
Compilation fixed.
Merge branch 'smearing_hex' into smearing_hex_debug

Conflicts:
	smearing/hex_add_terms_to_forces_stage_1.static
	smearing/hex_add_terms_to_forces_stage_2.static
	smearing/hex_hex_smear_forces.c
	smearing/stout_add_stout_terms_to_forces.static
Remove redundant files.