0021308: EDF 1923 SMESH: Remove hard-coded dependency of the external mesh plugins from the SMESH module

* Improve documentation for meshing plug-ins (in particular, dynamically added methods)

src/GEOM_SWIG/geompy.py

@@ -31,13 +31,22 @@ import salome
 import geompyDC
 from salome import *
 
+# retrieve GEOM engine in try/except block
+# to avoid problems in some cases, e.g. when generating documentation
+try:
+    # get GEOM engine
     geom = lcc.FindOrLoadComponent( "FactoryServer", "GEOM" )
+    # initialize GEOM with current study
     geom.init_geom( salome.myStudy )
 
-# Export the methods of geompyDC
+    # export the methods of geompyDC
     for k in dir( geom ):
 	if k[0] == '_': continue
 	globals()[k] = getattr( geom, k )
+        pass
     del k
     from geompyDC import ShapeType, GEOM, kind, info, PackData, ReadTexture, EnumToLong
-
+    pass
+except:
+    geom = None
+    pass

src/GEOM_SWIG/geompyDC.py

@@ -73,9 +73,14 @@
 
 ## @}
 
+# initialize SALOME session in try/except block
+# to avoid problems in some cases, e.g. when generating documentation
+try:
     import salome
     salome.salome_init()
     from salome import *
+except:
+    pass
 
 from salome_notebook import *