~jose-soler/siesta/unfolding

A guide of examples is included. Some of the previous examples
are substituted for more physically relevant ones. 
Input format of 'meshgen.c' modified.

removed:
  Util/Unfolding/Examples/Al/
  Util/Unfolding/Examples/Al/Al.fdf
  Util/Unfolding/Examples/Si/Amorphous/Si216/a-si216.fdf
  Util/Unfolding/Examples/Si/Atom/
  Util/Unfolding/Examples/Si/Atom/FCC/
  Util/Unfolding/Examples/Si/Atom/FCC/si_atom.fdf
  Util/Unfolding/Examples/Si/Atom/SC/
  Util/Unfolding/Examples/Si/Atom/SC/si_atom.fdf
  Util/Unfolding/Examples/Si/Bulk/Si2/
  Util/Unfolding/Examples/Si/Bulk/Si2/si2.fdf
  Util/Unfolding/Examples/Si/Surfaces/
  Util/Unfolding/Examples/Si/Surfaces/100/
  Util/Unfolding/Examples/Si/Surfaces/100/Si4x2.8l.apwdata
  Util/Unfolding/Examples/Si/Surfaces/100/si100.2x4.bulk.fdf
  Util/Unfolding/Examples/Si/Surfaces/100/si100.2x4.fdf
  Util/Unfolding/Examples/Si/Surfaces/100/si100.2x4coord.fdf
  Util/Unfolding/Examples/Si/Surfaces/111/
  Util/Unfolding/Examples/Si/Surfaces/111/Si111.coordinates.fdf
added:
  Util/Unfolding/Examples/C/
  Util/Unfolding/Examples/C/Diamond/
  Util/Unfolding/Examples/C/Diamond/diamond.fdf
  Util/Unfolding/Examples/C/Graphene/
  Util/Unfolding/Examples/C/Graphene/Bilayer/
  Util/Unfolding/Examples/C/Graphene/Bilayer/bilayer.fdf
  Util/Unfolding/Examples/C/Graphene/Bilayer/meshgen.dat
  Util/Unfolding/Examples/C/Graphene/Divacancy/
  Util/Unfolding/Examples/C/Graphene/Divacancy/7X7/
  Util/Unfolding/Examples/C/Graphene/Divacancy/7X7/divacancy-7X7.STRUCT_IN
  Util/Unfolding/Examples/C/Graphene/Divacancy/7X7/divacancy-7X7.fdf
  Util/Unfolding/Examples/C/Graphene/Divacancy/7X7/meshgen.dat
  Util/Unfolding/Examples/C/Graphene/Divacancy/8X8/
  Util/Unfolding/Examples/C/Graphene/Divacancy/8X8/divacancy-8X8.STRUCT_IN
  Util/Unfolding/Examples/C/Graphene/Divacancy/8X8/divacancy-8X8.fdf
  Util/Unfolding/Examples/C/Graphene/Divacancy/8X8/meshgen.dat
  Util/Unfolding/Examples/README
  Util/Unfolding/Examples/Si/Amorphous/Si216/a-Si-216.coord.fdf
  Util/Unfolding/Examples/Si/Amorphous/Si216/a-Si-216.fdf
modified:
  Util/Unfolding/README
  Util/Unfolding/Src/meshgen.c