Fix missing actualstep in b4step calls

[mandli]

Addresses #667

[mandli]

This also adds actualstep checks for storm fields and multilayer stuff.

[mandli]

Also adds an initialization for tend_force_dry as it is used without being defined in qinit_module otherwise. Sets the default value to tend_force_dry = -huge(1.d0).

[rjleveque]

Lots of white space is cleaned up too, which is good to do but makes it a bit hard to see all the actual code changes.

One thing I noticed is that the call to stepgrid in advanc.f and prepbigstep no longer has actualstep in the parameter list, but it is still in calling sequence in stepgrid.f. It's not used in stepgrid now, so remove it, and also from multilayer/stepgrid.f and bouss/stepgrid.f ?

[mandli]

I just added those changes (I think I got them all).

Sorry about the whitespace, switched editors and the new one has a setting that strips it and I keep forgetting to catch that.

[rjleveque]

Seems to work, but this time I will run all the examples again before releasing!