157 add acceleration computation (#336)

* add functions for calcualtion of acceleration

* remove check format errors, liek trailing white space, lines too long

* imprive description in compute_individual_acceleration

* corrected the descriptions in the acceleration_calculator

* Update methods.rst

* Method_utils was getting too long

* reformat changed files with format script

* add plot script for acceleration

* Update plotting.py

* Update __init.py

* update __init__.py to include plot_acceleration

* small change in function description

* describe acceleration usage in user guide notebook

* running format script

* small change, erase whitespace in docstring

* update methods.rst

* correct ValueError text for acceleration border method

* resolve syntax mistakes in documentation of acceleration_calculator

* delete extra line in method_utils

* include functions in __all__ list

* reinclude summary line of compute_voronoi_acceleration

* in user_guide hide cells related to plotting

* small changes in user_guide

* resolve conflict in user_guide

* small syntax changes in user_guide

Author: JuleAdrian

docs/source/api/methods.rst

@@ -30,6 +30,13 @@ Flow
     :no-private-members:
     :no-special-members:
 
+Acceleration
+^^^^^^^^^^^^
+
+.. autoapimodule:: acceleration_calculator
+    :members:
+    :no-private-members:
+    :no-special-members:
 
 
 Further measurements