Add changes to calculate_mean_and_stdv

Author: lguerard

CHANGELOG.md

@@ -164,6 +164,7 @@ detailed information, please refer to the updated API documentation.
 * `imcflibs.listdir_matching` changed to be able to use regex patterns for
   matching. The regex pattern is passed as a string and the function will
   return a list of all files matching the regex pattern.
+* `imcflibs.imagej.misc.calculate_mean_and_stdv` to allow for rounding the results.
 
 ## 1.4.0