[GRASS-dev] Access to GRASS GIS addons

[Nikos Alexandris]

Here a working solution (as explained/provided by Stefan) for the
"Processing Toolbox". Note, below "grass-ltr" maybe any grass 7.x
version, like grass-7.4.svn


1. Copy a GRASS GIS addon, say `r.example` under
```
C:\OSGeo4W64\apps\grass\grass-ltr\scripts\
```

2. Copy a Windows Batch file named after the addon, of course with the
extension of the file being `.bat` under
```
C:\OSGeo4W64\apps\grass\grass-7.4.svn\bin\ # r.estimap.bat
```
whose content should be:
```
@"%GRASS_PYTHON%" "%GISBASE%/scripts/<AddonName>.py" %*
```

3. For the description of the UI, copy `r.example.txt` under
```
C:\OSGeo4W64\apps\qgis\python\plugins\processing\algs\grass7\description\
```

The above steps will make the addon listed under the list of GRASS GIS
algorithms, inside the Processing toolbox.


4. There is another thing (yet to test): perhaps a file name r_example.py
is required under

in C:\OSGeo4W64\apps\qgis\python\plugins\processing\algs\grass7\ext

Looking at existing files there-in, they are not the "same" and I guess
it's going to be required (to understand what and how) in order to get
an addon running as expected.

Nikos
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