Improvements for MicroDAQ module:

- Make data decimation configurable
- Addded some documentation
- Some code cleaning (eliminate warnings, move internal classes into detail namespace)

Modules/include/MicroDAQ.h

@@ -10,8 +10,33 @@
 
 namespace ChimeraTK {
 
+  namespace detail {
+    struct AccessorAttacher;
+    struct H5storage;
+    struct DataSpaceCreator;
+    struct DataWriter;
+  }
+
+  /**
+   *  MicroDAQ module for logging data to HDF5 files. This can be usefull in enviromenents where no sufficient logging
+   *  of data is possible through the control system. Any ChimeraTK::Module can act as a data source. Which variables
+   *  should be logged can be selected through EntityOwner::findTag().
+   */
   struct MicroDAQ : public ApplicationModule {
-      using ApplicationModule::ApplicationModule;
+
+      /**
+       *  Constructor. decimationFactor and decimationThreshold are configuration constants which determine how the
+       *  data reduction is working. Arrays with a size bigger than decimationThreshold will be decimated by
+       *  decimationFactor before writing to the HDF5 file.
+       */
+      MicroDAQ(EntityOwner *owner, const std::string &name, const std::string &description, uint32_t decimationFactor=10,
+               uint32_t decimationThreshold=1000, bool eliminateHierarchy=false,
+               const std::unordered_set<std::string> &tags={})
+      : ApplicationModule(owner, name, description, eliminateHierarchy, tags),
+        decimationFactor_(decimationFactor), decimationThreshold_(decimationThreshold) {}
+
+      /** Default constructor, creates a non-working module. Can be used for late initialisation. */
+      MicroDAQ() : decimationFactor_(0), decimationThreshold_(0) {}
 
       ScalarPushInput<int> trigger{this, "trigger", "", "When written, the MicroDAQ write snapshot of all variables "
                 "to the file", {"MicroDAQ.CONFIG"}};
@@ -26,11 +51,13 @@ namespace ChimeraTK {
       ScalarOutput<uint32_t> currentFile{this, "currentFile", "", "File number currently written to.",
                 {"MicroDAQ.CONFIG"}};
 
-      void mainLoop() override;
-
       /** Add a Module as a source to this DAQ. */
       void addSource(const Module &source, const std::string &namePrefix="");
 
+    protected:
+
+      void mainLoop() override;
+
       template<typename UserType>
       VariableNetworkNode getAccessor(const std::string &variableName);
 
@@ -50,6 +77,14 @@ namespace ChimeraTK {
       /** Overall variable name list, used to detect name collisions */
       std::list<std::string> overallVariableList;
 
+      /** Parameters for the data decimation */
+      uint32_t decimationFactor_, decimationThreshold_;
+
+      friend struct detail::AccessorAttacher;
+      friend struct detail::H5storage;
+      friend struct detail::DataSpaceCreator;
+      friend struct detail::DataWriter;
+
   };
 
 } // namespace ChimeraTK