Doxygen is rather verbose and scanning .git subdirectory produces a
lot of noise.
Limit scanning only to to subdirectories that have data for doxygen.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>
Things are grouped by association within source files. Sorting by
name effectively breaks the grouping in the resulting documentation.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>
