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we have to tip toe around otbcli script due to settings such as
PATH and PYTHONPATH in otbenv.profile and otbenv.bat.
Now the solution is not specific to binary packages but rather to
existence of otbenv which is only available in binary packages

default app path is added to app dir list which is
<prefix>/lib/otb/applications

DONOT store this variable in qgsettings. A new/updated install of otb in
same location will mislead users

raise error for invalid otb application path
TODO: update otb_application folder when otb_directory is updated

These files were adeed for testing. From now on, one must generate them
locally using otbQgis module. Testing is needed on that.