This function simply builds the raw Python and batch commands
needed to acces the Python QGIS API.
Usage
build_cmds(qgis_env = set_env())
Arguments
qgis_env
Environment settings containing all the paths to run the QGIS
API. For more information, refer to set_env.
Value
The function returns a list with two elements. The first contains a
raw batch file and the second the python raw command both of which are
later on needed to access QGIS from within R via Python (see
execute_cmds).