readline() was behaving differently between local and url source.
In url case calling readline did not pause script execution. User directly ended up
in input validation while loop.

Functions and previous metadata extractrion.

Remove unicode encoding problem, tidyverse dependencies.
Only package required: openxlsx, ggplot2, emmeans.

Initial master script refactor to only perform create workbook
with data, meta data and variable defintion. Correct indentation, style,
design. Add very verbose comments for newbies.

Signed of by: Antoine Languillaume

Update Master_Script.R, fixed coersion to character in data frames due to reading colnames as data L 186-193

replaced longitude, latitude with coordinates (long.lat) in meta data

Added latitude to meta data 

# replace the unicode representation by "e" yielding "Efficiencie"
#d$fertilizer <- str_replace(d$fertilizer, "\\\\u00c3\\\\u00ab\\\\u00eb", "e")
##changed to grep which should work on Mac