+ Add system timestamps to lua read() and new lua read_line() per global options; prevented warnings

+ Add missing timestamp-format epoch; update send_ to use fsync and tcdrain like normal tty_sync does; rework read_line to save partial line at timeout

examples/lua/lines.lua

@@ -0,0 +1,17 @@
+read(1000, 8000) -- read initial config
+send("\n")
+read(650, 100) -- main menu
+send("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
+  msleep(880)
+  n = 1
+  while n > 0 do -- while not empty, read more
+    n, str = read_line(60)
+    msleep(60)
+  end
+end

examples/lua/pts.lua

@@ -0,0 +1,14 @@
+read(1000, 6000) -- initial config
+send("\n")
+msleep(100)
+read(650, 60) -- main menu
+send("S") -- S menu
+msleep(30)
+read(650, 60)
+send("t") -- Parallel Value Table
+read(650, 60)
+while true do
+  msleep(1000)
+  send("t")
+  read(650, 50) -- repeat PVT forever
+end

examples/lua/pvt.lua

@@ -0,0 +1,16 @@
+send("\n")
+msleep(100)
+-- read buffer with 0.5 sec delay
+read(160, 500)
+send("S")
+msleep(100)
+-- read buffer
+read(160, 500)
+-- query Parallel Value Table
+send("t")
+print(read(300, 500))
+while true do
+  sleep(1)
+  send("t")
+  print(read(300, 500))
+end