NIGHT RULES CHANGES

In response to several tries at FJAC scenario and how hard it was for the Germans to get into contact with the British/Indians I've revised the Night rules.

1. I allow units outside of NVR to be concealed unless currently firing/SNAFU or moving in Illumination (though cautious/crawling retain concealment as normal.)  I was playing it this way, but what I wrote was different and made it easier to fire.
2. I invoked the HSR that defending units add a +2 ATC drm to reflect their surprise and unwillingness to fire and give away their position or move and risk friendly fire.

Between these two it makes it very hard to engage German FJ as they approach - until someone SNAFUs or opens fire.