plot_summary: Summary plot
In hugo-pH/CyanoInterlabShinyApp: Cyano Interlab study Shiny App

A function to produce a summary plot of a given y variable, chossing with varibles will be used for colours and for facets

plot_summary(
  df,
  y_var,
  colour_var,
  f_rows_var,
  f_cols_var,
  df.labels,
  log_space,
  free_y_scale = F
)

`df`	A data.frame containing the data to be plotted.
`y_var`	A string with the column name of the variable for the y axis.
`colour_var`	A string with the column name of the variable to determine the colours.
`f_rows_var`	A string with the column name of the variable to the determine the rows for the facet_grid.
`f_cols_var`	A string with the column name of the variable to the determine the columns for the facet_grid.
`df.labels`	A data.frame with plot labels.