Peter M. Groen / libmodbus

Tested with Visual Studio 2022.

- check conversion
- display IP in in IPv6

Thank you @pboettch for initial proposal.

Useful functions when you are confronted with equipment which does
not respect the protocol, which behaves strangely or when you wish
to move away from the standard.

Thank you @mhei for the great initial version.

previous test would fail if one byte was non zero.

If the LT_INIT macro is not available in a *.m4 file to be
found during the autoreconf run, it is impossible to build
a useful configure script.

Therefore, we blacklist the LT_INIT macro so when it appears
unexpanded in the configure script, autoreconf will report
the failure instead of silently creating a broken configure.

This is generally a good idea for any macro not shipped with
Automake or Autoconf.

If the autoreconf program does not succeed, autogen.sh
should not succeed either.

The definition of "succeed" being "exit with exit code 0".

- remove doc build from autotools
- don't depend anymore on asciidoc
- don't provide man pages anymore
- new illustrations
- provide mkdocs instructions

- allocate exact memory required to store node and service strings
  instead of around 1kb of static memory.
- accept NULL value of service to use default Modbus port number (502)
- unit test updated

The new documentation will be updated in another commit.

Even the newest visual studio use /VERSION:major[.minor]  .  
It means link.exe  /VERSION:1.0  just  need two version number .
If Version = 1.0.0 , when visual studio  link the program , vs will produce link error:

```
1>"/OUT:C:\Users\Lenovo\Desktop\libmodbus-master\src\win32\modbus.dll" "/VERSION:1.0.0" /INCREMENTAL:NO /NOLOGO ws2_32.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /MANIFEST "/MANIFESTUAC:level='asInvoker' uiAccess='false'" /manifest:embed /DEBUG "/PDB:C:\Users\Lenovo\Desktop\libmodbus-master\src\win32\modbus.pdb" /MAP /SUBSYSTEM:CONSOLE /TLBID:1 "/IMPLIB:C:\Users\Lenovo\Desktop\libmodbus-master\src\win32\modbus.lib" /MACHINE:X86 /SAFESEH /DLL "C:\Users\Lenovo\Desktop\libmodbus-master\src\win32\/modbus.res"
1>"Debug\modbus-data.obj"
1>"Debug\modbus-rtu.obj"
1>"Debug\modbus-tcp.obj"
1>Debug\modbus.obj
1>LINK : fatal error LNK1117: option“VERSION:1.0.0” grammatical error
```
see: 
https://docs.microsoft.com/en-us/cpp/build/reference/version-version-information?view=msvc-160