Consider adding a troubleshooting section to readthedocs

[wknoben]

Could contain common or difficult-to-interpret errors. Examples:

• forcing input containing NaN (currently included in /input/meteo_files/common_pitfalls/)
• IDA spitting out a double error if it hits a SUMMA error while calculating residuals:

[ERROR][rank 0][/usr/SummaSundials/sundials-software/src/ida/ida.c:2388][IDAHandleFailure] At t = 144.694177369844, the residual function failed unrecoverably.


FATAL ERROR: run_oneGRU (gru nc = 1, gruId = 1)/run_oneHRU (hru nc = 1, hruId = 1)/coupled_em/opSplittin/varSubstep/systemSolv/summaSolve4ida/eval8summaWithPrime/computFlux/soilLiqFlx/surfaceFlx/update_surfaceFlx_FUSE_PRMS_derivatives: derivatives w.r.t. infiltration excess surface runoff not yet implemented

Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG
STOP