Add WARNING when file manager input not found.

[andywood]

This can lead to run errors that are difficult to decipher if a user is not expecting that other default parameters are being used. The warning appears as below (followed by an example of the errors occurring subsequently, which don't indicate that the user's main problem is a path error leading to skipping the reading of the trialParams file).

... 27 thCondSnow: jrdn1991 28 thCondSoil: funcSoilWet 29 spatial_gw: localColumn 30 subRouting: timeDlay startTime: iyyy, im, id, ih, imin = 1990 8 1 2 0 finshTime: iyyy, im, id, ih, imin = 1991 10 2 23 0 number of time steps = 3424 Skipping over LUTYPE = USGS

!! WARNING: trial parameter file not found; proceeding instead with other default parameters; check path in file manager input if this was not the desired behavior

theta_res = 0.0000000000000000 0.0000000000000000 0.0000000000000000
theta_sat = 0.0000000000000000 0.0000000000000000 0.0000000000000000
critSoilTranspire = 0.35999999999999999

FATAL ERROR: summa_paramSetup/paramCheck/critSoilTranspire parameter is out of range [NOTE: if overwriting Noah-MP soil table values in paramTrial, must overwrite all soil parameters]

[andywood]

There is some code in commit a377ad9 that is not yet needed. The idea was to store all the filemanager options in a structure similar to the decisions options, but most of the modules needed to do this are not available by the time the filemanager code is compiled -- it's one of the first. The code for those structures is still there but would be deleted if there's no way or desire to do this.

[andywood]

The latest commit in this PR just adds gru/gruId to the output files. I didn't have time to split hru/gru output files as discussed, but this will remove the step of creating/adding gruId to basin runoff before it can be routed by mizuRoute. At this point the summa output files can be routed directly (or after merging from a split domain run)

[bartnijssen]

Closing -- will be replaced by a number of small PRs