Small code improvements

src/config.cpp

@@ -1,20 +1,25 @@
 #include "config.hpp"
 
 namespace config {
-    // Receiver config.
+    // Number of receiving threads. Roughly 1 thread / (GB/s)
     int zmq_n_io_threads = 1;
     int zmq_receive_timeout = 100;
+    
+    // JSON header buffer size.
     int zmq_buffer_size_header = 1024 * 1024 * 0.2;
+    // Data message buffer size.
     int zmq_buffer_size_data = 1024 * 1024 * 10;
 
     // Ring buffer config.
     size_t ring_buffer_n_slots = 100;
+    // Delay before trying again to get data from the ring buffer.
     uint32_t ring_buffer_read_retry_interval = 5;
     
-    // H5 config.
+    // By how much to enlarge a dataset when a resizing is needed.
     hsize_t dataset_increase_step = 1000;
+    // To which value to initialize a dataset size.
     hsize_t initial_dataset_size = 1000;
 
-    // Try again to see if the parameters were passed.
+    // Delay in between attempts to see if the requred parameters were passed over the REST api.
     uint32_t parameters_read_retry_interval = 100;
 }