Fix hydraulic file reader: tabs at end of line and error checking

[SFRailsback]

This may have already been fixed: HydraulicFileReader crashes if there is white space (tabs, at least) at the end of a line.

Also: the documentation says that the code makes these checks, not all of which are implemented yet: The software makes several checks when reading in the cell hydraulics file: • The cell numbers must correspond with those in the cell geometry file: each cell defined in the geometry file receives hydraulic input and there are no cells in the hydraulic file but not in the geometry file. • The flows on line 3 must be in order of increasing magnitude. • The number of values on each row of hydraulic input (file lines 5 and higher) must equal one (the cell number) plus two times the number of flows defined line 3. • There must be no negative velocities. • Any negative depth values are set to zero (some hydraulic models as- sign negative depths to locations above the water level).

(submitted for inSTREAM too.)

[colinsheppard]

Steve, can you clarify what the first bullet means, in particular the phrase "there are no cells in the hydraulic file but not in the geometry file."