environments, error messages, and stack traces, oh my!

Changed the way processes are launched.
multishell.openTab and kernel.run now accept the current environment as a parameter.
That new process inherits a copy of the passed environment.
Reduces complexity as the calling process is not required to create a suitable env.
Stack traces have been greatly improved and now include the stack for coroutines that error.

sys/apps/network/snmp.lua

@@ -31,21 +31,14 @@ local function snmpConnection(socket)
 			socket:write('pong')
 
 		elseif msg.type == 'script' then
-			local env = kernel.makeEnv()
-			local fn, err = load(msg.args, 'script', nil, env)
-			if fn then
-				kernel.run({
-					fn = fn,
-					env = env,
-					title = 'script',
-				})
-			else
-				_G.printError(err)
-			end
+			kernel.run(_ENV, {
+				chunk = msg.args,
+				title = 'script',
+			})
 
 		elseif msg.type == 'scriptEx' then
 			local s, m = pcall(function()
-				local env = kernel.makeEnv()
+				local env = kernel.makeEnv(_ENV)
 				local fn, m = load(msg.args, 'script', nil, env)
 				if not fn then
 					error(m)