Move pipeline docs into own folder

docs/pipeline/cols-traits.csv

+var,units,Description
sp,, the species code used in other tables
Latin_name,,the latin name of the species
Leaf.N.mean,mg/g,Leaf Nitrogen per mass
Seed.mass.mean,mg,seed mass
SLA.mean,mm2/mg,specific leaf area
Wood.density.mean,mg/mm3,wood density
Leaf.N.sd,,
Seed.mass.sd,,
SLA.sd,,
Wood.density.sd,,
Leaf.N.exp,,
Seed.mass.exp,,
SLA.exp,,
Wood.density.exp,,
Leaf.N.genus,,
Seed.mass.genus,,
SLA.genus,,
Wood.density.genus,,
Leaf.N.nobs,,
Seed.mass.nobs,,
SLA.nobs,,
Wood.density.nobs,,
Max.height.mean,,"from NFI data I compute the 99% quantile in m and the same columns with ,sd, instead of ,mean, with either the mean sd within species if species mean or the mean sd with genus if genus mean because no species data a dummy variable with true or false if genus mean"
Max.height.sd,,
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docs/pipeline/cols-tree.csv

+var,Description
obs.id,  a unique identifier of observqtion (if multiple observation for a same tree)
tree.id,  a unique identifier of each tree
sp,  the species code
sp.name,
cluster,
plot,  the plot code
ecocode,  the ecoregion code (trying to merge similar ecoregion to have ecoregion with enough observation per ecoregion)
D,  diameter growth in cm
G,  the diameter growth rate in mm / yr.
dead,  a dummy variable 0 alive 1 dead
year,  the number of year for the growth measurement
htot,  the height of the individual (m) for the data base for which it is availble to compute max height per species
Lon,  Longitude of the plot in WGS84
Lat,  Latitude of teh plots in WGS84
perc.dead,  the percentage of dead computed on each plot to exlude plot with perturbation (equal 1 for plot with known perturbation)
weights,  the weigths of teh tree to have an estimation of basal area per m^2 (so 1/(m^2))
census,  the name of the year of the census 1
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