Make 1dfabe2 optional

Allow option to merge differently formatted docstrings. Consider https://doxygen.nl/manual/docblocks.html

javadoc (current (and only) style)

/**
...
*/

Qt style

/*!
...
*/

This is really implement to implement using the current Docstrings

Block of >= 2 comment lines

"A third alternative is to use a block of at least two C++ comment lines, where each line starts with an additional slash or an exclamation mark. Here are examples of the two cases:

///
/// ... text ...
///

//!
//!... text ...
//!

This is not hard, but requires parsing before Docstrings

///
/// \brief Write a scalar to a (new, extendible) DataSet in an open HDF5 file.
///
/// \param file opened file (has to be writeable)
/// \param path path of the DataSet
/// \param data the data to write (any supported type)
/// \param idx the indices to which to write
///
/// \return The newly created DataSet
///

is currently not recognised