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

The Documentation.docx file is said to be corrupted
when downloading from Gitlab. Fix attempt:
Open with Word > Save as > Overwrite existing.

fixed 
###check if workbook with variable definitions and metadata already present in processed and make sure not overwritten
by:
exist.wb= data.list.proc[which(data.list.proc==paste(wb.name,"_metadata.xlsx",sep=""))]

added 2. to ouputs

put \\ before ".R"