[sextante] fixed #7694. v.clean now accepts decimal values as input

Author: volaya

python/plugins/sextante/grass/description/v.clean.txt

@@ -3,7 +3,7 @@ v.clean - Toolset for cleaning topology of vector map.
 Vector (v.*)
 ParameterVector|input|Layer to clean|-1|False
 ParameterSelection|tool|Cleaning tool|break;snap;rmdangle;chdangle;rmbridge;chbridge;rmdupl;rmdac;bpol;prune;rmarea;rmline;rmsa
-ParameterNumber|thresh|Threshold|None|None|0
+ParameterNumber|thresh|Threshold|None|None|0.0
 OutputVector|output|Cleaned vector layer
 OutputVector|error|Errors layer