Add `Screw` class and corresponding unit test file
Move `Screw` class to `pysymoro/screw.py` file

Update unit test file accordingly.
Create `FloatingRobot` class
Add `pysymoro/screw6.py`
Add unit test corresponding to `Screw6` class
Add `pysymoro/tests/run_all_tests.py` file
Modify `Screw6` constructor and unit test
Add `DynParams` class and its unittest module

Add `DynParams` class which is a data structure to hold all the inertial
parameters, mass tensor parameters, friction parameters and external
force parameters.
Add `==`, `!=` operators to `Screw` and `Screw6`

Add `==` and `!=` operators to `Screw` and `Screw6` classes.
Add relevant unit test code for these operators.
Update `symoroui/labels.py` with new keys

Update `symoroui/labels.py` with new keys and include a new attribute to
store the widget keys in `symoroui/layout.py`.
Add `update_params()` to `DynParams` class

Add `update_params()` to `DynParams` class. This method receives a
dict as input argument and updates the parameter values mentioned in
the dict input.
Update corresponding unittest module to test the method.
Add `GeoParams` class and its unittest module

Add `GeoParams` class which is data structure to hold the geometric
parameters - frame, antecedant, sigma, mu, gamma, b, alpha, d, theta, r.
Add scaffolding code to `pysymoro/floatr.py`
Fix return value
Add `TransformationMatrix` class

Add `TransformationMatrix` class and a function to compute the
transformation between any two frames - `get_transformation_matrix()`.
Add unittest module for `get_transformation_matrix()`.
Add `pysymoro/tests/transformationmatrix.py` file.
Update `pysymoro/tests/run_all_tests.py` to discover all the unittest
modules in the folder and run the tests.
Fix name errors
Rename file

Rename `pysymoro/tests/test.py` to `pysymoro/tests/oldtest.py`.
Add unittest module for `TransformationMatrix` class

Add unittest module for `TransformationMatrix` class.
Modify `TransformationMatrix` class constructor to accept 3 forms of
input parameters.
DGM with transform chains

Also small bugs are fixen in the symbolmrg
Add str and repr overload

Add `__str__` and `__repr__` overload to `TransformationMatrix` class.