New functions: get_mean and get_phase, added better documentation

doc/manual.rst

@@ -458,9 +458,9 @@ Data Processing Outside DAMARIS
 
 For post-processing of the data, several options are available, depending on the format of the data. Most programs can handle ASCII files (gnuplot, Origin, fitsh, etc.), so this is the more flexible format. HDF can be read by pyTables, Matlab, Octave, R, Mathematica and more.
 
-
+**************************
 Experiment Script Commands
-==========================
+**************************
 
 Following is a list of available commands in an experiment script.
 
@@ -663,8 +663,9 @@ Following are convenient functions for use in loops.
           for tp in combine_ranges(mylinrange, mylogrange):
               yield inversion_recovery(tau=t)
 
+**********************
 Result Script Commands
-======================
+**********************
 
 Following is a list of available commands in a result script. These are methods to be applied to a ADC_Result and Accumulation object. An accumulation object needs to be created before any methods can be applied.