version 4.1.0

maybe fix hang on PIEthernet::interrupt()
replace piLetobe with piChangeEndian:
 * piChangeEndianBinary
 * piChangeBinary
 * piChangedBinary
PIDiagnostics::start now accept PISystemTime instead of number
add PITimer::start(PISystemTime, std::function<void()>) overload

CMakeLists.txt

@@ -2,9 +2,9 @@ cmake_minimum_required(VERSION 3.0)
 cmake_policy(SET CMP0017 NEW) # need include() with .cmake
 project(PIP)
 set(PIP_MAJOR    4)
-set(PIP_MINOR    0)
+set(PIP_MINOR    1)
 set(PIP_REVISION 0)
-set(PIP_SUFFIX   _alpha)
+set(PIP_SUFFIX   )
 set(PIP_COMPANY  SHS)
 set(PIP_DOMAIN   org.SHS)