Fix second stage of HEX smearing.
Fix issues in HEX force smearing. Results now much closer to numerical estimates, not yet correct.
Fixed (most of?) HEX smearing by clearing up confusion in inner loop shared function with stout smearing.
Merge branch 'smearing_hex' of github.com:deuzeman/tmLQCD into smearing_hex
Fix segfault in MPI runs with HEX smearing, miscellaneous small issues elsewhere.
Merge remote branch 'deuzeman/smearing_hex' into smearing_hex_debug