Peter M. Groen / libmodbus

This time the change is definitive :)

- new function modbus_flush
- new names and values for error defines
- finer recovery on error
- merge TOO_MANY_DATA and INVALID_DATA
- stop unit-test-master at the first error
- FLUSH_OR_RECONNECT_ON_ERROR -> FLUSH_OR_CONNECT_ON_ERROR
- more precise tests in unit-test-master

- MAJOR changes to the API (see MIGRATION)
- New unit tests
- Removed TODO list
- Updated NEWS & MIGRATION files

- upgrade to WAF 1.5.3
- smaller WAF scripts
- fix using of modbus.h with WAF
- updated configure.ac and Makefile.am files
- change include paths in test files

- The coil and registers are wrote by the master and not assigned by the
  slave anymore
- The data used to write are the ones in unit-test.h
- The read test is done after the write test

- rename test-master-random => random-test-master
- fix memset
- update README
- add the files to configure.ac and wscript

- s/datas/data/
- the warning is now an error
- add some checks in modbus.c
- add unit tests
- remove the TODO item
- minor 80 columns changes

It's slower to pass non aligned values.

- add some unit tests
- add PRESET_MULTIPLE_REGISTERS support in manage_query()

- cleanups in offset/resp_length vars
- cleanups in comments
- add FORCE_MULTIPLE_COILS in manage_query

- Add some tests for force_single_coil

o illegal data value
  o illegal data address
- Better naming of build_query_basis and build_response_basis
- build_response_basis can be use by response_exception
- Reduce variable declarations
- Close 3 FIXME
- Add a test in unit-test-master

- Major changes to unit-test-master/slave to add 4 tests
- Use new functions to manipulate bits
- Reduce memory usage (allocate only the required space and use
  uint[8|16]_t pointers)

- Separate unit-test-master and test-master-random