Lammps-step

* Switched to new functionality in the SEAMM widgets to simplify the layout of the
trajectories panel.

* Improved control over the trajectories of positions, velocities, etc. to allow the
user to give the number of points in the trajectory rather than the time interval
of samples
* Added volume of the cell to properties, and the cell lengths, density, and volume
for NVE and NVT, where those parameters don't vary but are nonetheless useful in
subsequent analysis.

2024.6.28.1 -- Internal release to fix issue making Docker image.

* Added ability to get the energy and forces from single point calculations to supprt
e.g. energy scans.
* Fixed issue with assigning atoms types if they have not been assigned but are None
* Updated for change in the order of units in the new version of pint
* Improved analsys based on the output file.

* Corrected an issue running LAMMPS via Python, introduced in the new scheme for
executing. It ignored parallelism.

* Fully support ~/SEAMM/lammps.ini
* Updated to new installer
* Support for Conda and Docker installation.

2024.1.18 -- Restructured to support running in containers.

* A property, such as the total energy, can be a constant over an MD run due to
precision of the trajectory. This caused errors because the autocorrelation
function is not defined. These cases are now detected and the ACF not calculated
for them.