Total Nitrogen (SLNI) input from SOIL.SOL saved equals to -9.0 in the temporary file when should be -99.0

[fabiooliveira72]

NOTE that there is no error. However it is not a good practice.

Total Nitrogen (SLNI) input from SOIL.SOL saved equals to -9.0 in the temporary file when should be -99.0. The value of this variable is also stored in SOILPROP and sent to other subroutines for later use.

TOTN is set to -9 and then sets TotOrgN. If there is no TOTN (TOTN = -9) TotOrgN will be set to -99. Then, TotOrgN will be tested at SOMINIT_c.for at ~line 237 and will jump to the ELSE statement where has 'UseDefaultN = TRUE'.

This will trigger LayerLoopN2 with default SOM1E, SOM2E and SOM3E values by DSSAT.