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This PR implements a number of small fixes for issues tagged for resolution in release 0.9.4:

• Updated installation documentation to recommend conda installation first, then pip (resolves Change installation instructions to recommend Conda, warn about compiling Slycot #850)
• Added more documentation about Nyquist plot scaling (resolves Incorrect nyquist plot #830)
• Deprecated issys() (resolves ctrlutil.issys() is confusing (tests for LTI) #876)
• Changed short package name for control.optimal from opt to obc consistently throughout documentation.
• Fixed sphinx processing of version to allow proper links to source code (resolves Readthedocs points to wrong version of source code for .postN release #837).
• Added numpy 1.24.2 to list of exceptions for flatness test on linux using Generic BLAS (resolves Numpy 1.24.2 breaks OS/BLAS test matrix #866).
• Additional updates to docstrings and rst files as I went through the above items.

Coverage: 94.535% (+0.001%) from 94.533% when pulling 1d7480a on murrayrm:smallfixes-26Mar2023 into 0422c82 on python-control:main.

use obc as standard prefix for control.optimal

981104b

update installation instructions per issue python-control#850

6a18702

deprecate ctrlutil.issys()

1d670a7

add documentation on scaled portions of Nyquist plot

423744a

fix sphinx version processing to point to released source code

1aa6a7e

add known failure for OS/BLAS matrix: numpy 1.24.2

7350e79

reset_defaults() at start of each doctest

1d7480a

sawyerbfuller approved these changes Mar 31, 2023

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