Merge branch 'doxy/commands'
* doxy/commands:
Update documentation for doxygen tags
Fix doxygen translation of \p command for python
Fix doxygen handling of \em tag for python
Minor formatting updates to doxygen docs
Reformat tag lists in doxygen documentation
Add doxygen_code_blocks_runme.java
Special handling for python doctest code blocks
Add new doxygen test doxygen_code_blocks
Handle doxygen code command with language option
Improve doxygen parser handling of \code content
Flag optional arguments in doxygen pydoc output
Add parameter direction to doxygen pydoc output
Support doxygen \param[] commands