[os_xml] remove unused and obsolete debug code
[os_regex] remove unimplemented declaration of 'OS_Match3'
[os_xml] fix examples (do we need those after the unit tests?)
[os_regex] update examples
Merge pull request #283 from cgzones/os_regex_examples

[os_regex] update examples
Merge pull request #284 from cgzones/os_xml_examples

[os_xml] update examples
Merge pull request #289 from cgzones/os_xml_remove_debug

[os_xml] remove unused and obsolete debug code
Merge pull request #288 from cgzones/remove_declaration

[os_regex] remove unimplemented declaration of 'OS_Match3'