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 Changes in v2.1.1 compared to v2.1.0
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dprice (62):
      fixed install target so that installs gsplash-hdf5, seren read
      added axis=3 option to draw box, ticks and numbers but no labels
      BUG FIX with exact solution not appearing on second and subsequent panels if multiplot is used
      pressing numbers now sets the timestep jump according to the digits typed (MUCH more sensible); 
       also pressing 0 gives timestep jump of 10, 100 etc (thanks to Terry Tricco for the rather obvious suggestion)
      bug fix with h5part read if smoothing length present in file, also with ndimV setting
      vector legend uses semi-transparent background
      h5part data read reads types from Phase if MatID is not present
      h5part read less verbose for second and subsequent files
      BUG FIX with itype warning when reading public ndspmhd code output; also ndspmhd read less verbose
      h5part read now recognises any vector quantity from _0, _1, _2 subscripts
      arrow shape takes justification parameter so either head or tail can be at specified position
      install-cairo script works with cairo-1.12.2.tar.xz (xz not gz compression); 
       plus gives correct hint for Darwin library path
      implemented irregular shaped particle selection on shift-click in interactive mode (pgplot+giza), 
       plus circular selection/marking of particles with middle click (giza backend only)
      vector plot legend uses rounded, semi-transparent rectangle for background (giza only)
      fixed issues compiling in double precision
      better kind selection for single precision prompt routine
      minor bug fix in real prompt interface if min/max used
      added DOUBLEPRECISION=yes option to compile splash in double precision (currently only works for certain data reads)
      compiler warnings under gfortran 4.6 fixed
      preprocessing added so that gadget-hdf5 read compiles with both hdf5 1.8 as well as against earlier versions
      BUGS FIXED with gadget HDF5+multiple files; seems to work now; better error handling in GADGET reads
      BUG FIX with calculated quantities + change of coordinate systems
      BUG FIX with wrapping to periodic boundaries in splash to grid; can also now specify periodicity in x,y and z boundaries separately in splash to grid
      compilation/dependency issue fixed with iexact
      fixed dependency issue during compilation
      ifort remark silenced
      bug fix/regression with openMP in splash to grid
      prompts added to adjust plot limits to device aspect ratio when changing paper size and in limits menu
      ifort compiler remarks silenced
      unused variables removed
      -pedantic and -Wextra added to debug flags for gfortran
      pedantic warning fixed
      compiler warnings (unused dummy variables, real*8 declarations) fixed
      unused parameter warnings fixed
      compiler warnings about unused module variables fixed
      ncolumns set to zero if no data read to avoid out-of-bounds issues
      handles ncolumns > maxplot error cleanly
      BUG FIX/regression with definition of int8 kind (sphNG read)
      more concise/better formatted help for interactive mode
      userguide updated for new version/obsolete references to PGPLOT removed/updated appropriately for GIZA
      added example shock tube figure to userguide
      minor issues with docs fixed