Clean up lua API

Rename modem_send() to send()
Rename send to write()

examples/lua/automatic-linux-login.lua

@@ -18,9 +18,9 @@ if (1 == found) then
     local hostname = string.match(match_str, "^%w+")
     local login = logins[hostname]
     if (nil ~= login) then
-        send(login.username .. "\n")
+        write(login.username .. "\n")
         expect("Password:")
-        send(login.password .. "\n")
+        write(login.password .. "\n")
     else
         io.write("\r\nDon't know login info for " .. hostname .. "\r\n")
     end

examples/lua/read.lua

@@ -1,14 +1,14 @@
 read(1000, 6000) -- initial config
-send("\n")
+write("\n")
 msleep(100)
 read(650, 60) -- main menu
-send("S") -- S menu
+write("S") -- S menu
 msleep(30)
 read(650, 60)
-send("t") -- Parallel Value Table
+write("t") -- Parallel Value Table
 read(650, 60)
 while true do
   msleep(1000)
-  send("t")
+  write("t")
   read(650, 50) -- repeat PVT forever
 end

examples/lua/read_line.lua

@@ -1,13 +1,13 @@
 read(1000, 8000) -- read initial config
-send("\n")
+write("\n")
 read(650, 100) -- main menu
-send("S") -- S menu
+write("S") -- S menu
 n = 1
 while n > 0 do -- while not empty, read more
   n, str = read_line(25)
 end
 while true do
-  send("t") -- query PV table
+  write("t") -- query PV table
   msleep(880)
   n = 1
   while n > 0 do -- while not empty, read more