Pirecorder

* Added printing of date when starting pirecorder so it is easy to
distinguish different runs in the logfile

* Fixed imgseq taking max imgnr beyond when imgtime was already reached to
do with slow writing of images when resolution is large

* Fixed wrong reference of now obsolete set_config() to settings function
* Updated the documentation and jupyter notebook with this new functionality
* Video duration and size are now printed after creation 2021-02-09
* Integrated new functionality: max video duration and max video filesize
parameters can now be set to automatically split videos during recordings,
helping overcome the creation of very long and large videofiles
* Added print statement to notify when custom brightness setting is being
overridden by setting in cusbright.yml file
* Added note about Bullseye not working with picamera and therefore pirecorder (2021-12-02)

* Added statement to camconfig and documentation website regarding minimum
recommended resolution
* Contribution statement added to README
* Included improved statement of need in JOSS paper and documentation
* Integrated ability to store ROI directly when running stream from the
command line
* Added test.py file for testing all functionalities of pirecorder
* Improved paper in a number of ways
* Changed user settings to facilitate getting max resolution
* Fixed autoconfig stream not releasing camera after use
* Some final improvements to the paper for JOSS
* Small fixes
- Added missing subdir to pirecorder settings documentation
- Fixed delete parameter name in schedule documentation
- Removed pandas as dependency of linked pythutils package
- Fixed jekyll issue that prevented documentation website of not updating

* Added accompanying academic paper for pirecorder, submitted to The
Journal of Open Source Software

* Updated recording mode to be able to record at higher framerates and
* updated documentation with a note about high framerates.
* Fixed resolution for images not needing to be divisible by multiples of 16