Tray ordering is from bottom to top

[bernalde]

There are a couple of unused (thankfully!) functions that have the wrong ordering of the constraints
Examples are:

dsda-gdp/gdp/column/gdp_column.py

Line 441 in 8f00fff

def tray_ordering(m, t):

dsda-gdp/gdp/column/gdp_column.py

Line 388 in 8f00fff

def monotonoic_temperature(_, t):