Made a prospecting guide and fixed survex station description. Removed parsing of underground descriptions to wikis.

core/models_survex.py

@@ -93,7 +93,10 @@ class SurvexLeg(models.Model):
 # 
 class SurvexBlockLookUpManager(models.Manager):
     def lookup(self, name):
-        blocknames = name.split(".")
+        if name == "":
+            blocknames = []
+        else:
+            blocknames = name.split(".")
         block = SurvexBlock.objects.get(parent=None, survexfile__path="all")
         for blockname in blocknames:
             block = SurvexBlock.objects.get(parent=block, name__iexact=blockname)