Issue 187 enable skipped ztest suites (#189)

* Fix some ztests that were skipped

* Expose bacapp_same_value()

* Fix bacapp, ptransfer tests

* Fix bugs in Load_Control object & tests

* refactor days functions from datetime module

* fix legacy ctests

* Add bacnet/basic/sys/days.[ch] to Zephyr build

* Update ztest to match from Zephyr v2.6.0; update ringbuf, datetime to build

* Fixup ztest test for object/acc

* Fix bvlc_address_from_ascii; enable/fix bvlc test

* Comment cleanup

* test/bacnet/basic/object/lc partially enabled

* Fix bacapp_decode_data_len return status on erroneous input

* fix ztest include fatal error

* fix ztest strsignal reference fatal error

* fix zassert_mem_equal reference syntax error

* fix zassert_mem_equal reference syntax error

Co-authored-by: Gregory Shue <gregory.shue@legrand.us>
Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

README.md

@@ -112,6 +112,15 @@ to generate a Code::Blocks project:
     c:\> cd build/
     c:\> cmake .. -G"CodeBlocks - MinGW Makefiles"
 
+
+The the available tests may be run with the command sequence:
+
+    $ make clean
+    $ make cmake
+    $ cd build
+    $ CTEST_OUTPUT_ON_FAILURE=1 make test
+    $ cd ..
+
 The demo applications are all client applications that provide one main BACnet
 service, except the one server application and one gateway application, 
 a couple router applications, and a couple of MS/TP specific applications.