Tweak documentation
Tweak StreamRequestHandler
Fix tests for CTL-C interruption
Add restrictions for CTRL-C interruption
Fix a failing test in Windows: SystemExitSpec

The exit code of -1 or 256 (which is out of range) depends on OS.

Mac: -1 -> 255, 256 -> 0
Windows: -1 -> -1, 256 -> 256
Support automatic initialization by dummy script