modify x-label printouts
modify x-label printouts

trim x-labels to smallest non-zero decimal, and drop decimal place if
  the x-value is an integer

Aluriak/bashplotlib,asbjorn/bashplotlib,joshloyal/bashplotlib,asbjorn/bashplotlib,joshloyal/bashplotlib,glamp/bashplotlib,glamp/bashplotlib,Aluriak/bashplotlib