Add forgotten asDouble() method to the Parameter interface.

* New: In vlsisapd/PyConfiguration, add asDouble() to the Parameter
    Python wrapper.
* New: In CRLCore/helpers/overlay, add support for float parameters
    in configuratuon.

crlcore/python/helpers/overlay.py

@@ -62,6 +62,8 @@ class Configuration:
                 Cfg.getParamEnumerate(attr).setInt( val )
             else:
                 Cfg.getParamInt(attr).setInt( val )
+        elif isinstance(val, float):
+            p = Cfg.getParamDouble( attr ).setDouble( val )
         elif '%' in val:
             Cfg.getParamPercentage(attr).setPercentage( float(val[:-1]) )
         else:

vlsisapd/src/configuration/src/PyConfiguration.cpp

@@ -210,6 +210,7 @@ namespace Cfg {
         .def("asPercentageString", &Parameter::asPercentageString)
         .def("asBool"            , &Parameter::asBool)
         .def("asInt"             , &Parameter::asInt)
+        .def("asDouble"          , &Parameter::asDouble)
         .def("asPercentage"      , &Parameter::asPercentage)
         .def("getSlaves"         , &Parameter::getSlaves, return_value_policy<reference_existing_object>())
         .def("getValues"         , &Parameter::getValues, return_value_policy<reference_existing_object>())