Added support for mod09GA

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@70085 15284696-431f-4ddb-bdfa-cd5b030d7da7

imagery/i.modis.qc/i.modis.qc.html

@@ -3,6 +3,8 @@
 <em>i.modis.qc</em> extracts Requested Quality Assessment flags from the
 following MODIS products: MOD09A1, MOD09Q1, MOD11A1, MOD11A2, MOD13A2, MOD13Q1,
 MCD43B2. This does include MOD09A1 QA_state_500m layer (see Notes).
+<br>
+Added MOD09GA support in 2016, it follows MOD09A1 and its StateQA, but does not have BRDF State QA, instead has Salt Pan State QA.
 
 <h3>MOD09A1 and MOD09Q1</h3>
 <pre>