Fix time-domain calculations of the optimal observation filter
The calculations for the time-domain optimal observation filters have been fixed.
There are some minor improvements in other fields such as:
- A bug in
obsFiltTD()
that screwed up the dimensions of the arrays when there was only one source. - A bug in
ptSrcFieldTD()
that screwed up the dimensions of the arrays when there was only one source. - The virtual microphone geometry generation function was heavily modified, and its interface has changed.
This merge closes the Closes #8 (closed).