rcal-936 Update docs and add skycell_asn as a script at install time

docs/conf.py

@@ -274,7 +274,7 @@ def check_sphinx_version(expected_version):
 # further.  For a list of options available for each theme, see the
 # documentation.
 
-html_theme_options = {"collapse_navigation": True, "version_selector": True}
+html_theme_options = {"collapse_navigation": True}
 
 #        "nosidebar": "false",
 #        "sidebarbgcolor": "#4db8ff",

docs/roman/associations/commands.rst

@@ -7,3 +7,4 @@ Association Commands
    :maxdepth: 2
 
    asn_from_list.rst
+   skycell_asn.rst

docs/roman/associations/skycell_asn.rst

@@ -0,0 +1,91 @@
+.. _skycell_asn:
+
+skycell_asn
+===========
+
+Create an association using either the command line tool
+``skycell_asn`` or through the Python API using either
+:class:`romancal.associations.skycell_asn.Main` or
+:func:`romancal.associations.skycellasn.skycell_asn`
+
+
+Associations
+^^^^^^^^^^^^
+
+Refer to TBD for a full description of associations.
+
+To create an association, use the following command:
+
+.. code-block:: python
+
+		skycell_asn file_list -o my_program
+
+where the individual calibrated detector files are in the current directory and the -o is the root
+for the output associations. To get a complete list of options you can run the command with the
+\-h option
+
+.. code-block:: python
+
+		skycell_asn -h 
+
+
+By knowing the structure of the conventional file name you can generate custom associations based
+on the information included in the file names. 
+The current naming convention for the input files consists of a Visit_ID + Exposure_ID + detector + suffix
+Where the Visit_ID is a 19 digit string
+PPPPPCCAAASSSOOOVVV, with
+
+PPPPP = Program number
+CC = Execution plan number
+AAA = Pass number (within execution plan)
+SSS = Segment Number (within pass)  
+OOO = Observation number (within the leg, not to be confused with the Observation ID)
+VVV = Visit Number (within the observation)
+
+and the Exposure_ID is a four digits designating the exposures
+
+eeee = Exposure number (within the visit)
+
+The detector is WFI01, WFI02, ... WFI18
+
+The suffix indicates the processing level of the file and to create products based on the
+skycells the suffix should generally be 'cal'.
+
+and the file name is constructed as,
+rPPPPPCCAAASSSOOOVVV_eeee_detector_suffix.asdf
+
+To give a more concrete example we'll use the APT example program for the
+High Latitude Wide Angle Survey (hlwas). The program is 00991, the execution plan number is 01,
+there are 12 passes, 5 segments, 4 observations and a various number of visits.
+For this example we want to select a single filter, say F158, and that is segment 003.
+So to generate the visit level associations for observation 001 we would select the files using the bash
+command line,
+
+.. code-block:: text
+
+		skycell_asn r0099101001003001001_*_cal.asdf  -o  r0099101001003001001 --product-type visit
+
+Where the wildcard selects all the exposures for visit 001 and generates associations based on the skycells
+the exposures will populate. This will generate associations based the skycells that the exposures can
+contribute data to. The association files will be json files with names based
+
+.. code-block:: text
+
+	r0099101001003001001_<skycell name>_<product_type>_<filter>_<release product name>_i2d_asn.json
+
+or for the selections above
+
+.. code-block:: text
+
+	r0099101001003001001_r257dp63x98y83_visit_F158_prompt_i2d_asn.json
+
+where the skycell name can vary based on the location on the celestial sphere and the i2d indicates
+that this is resampled 2-d imaging data. The release product name can be changed from the default
+by adding the optional argument --release-product <new name> to the command line. 
+
+An analogous command to generate the pass level products, again setting segment to 003 to only select
+the F158 filter. 
+
+.. code-block:: text
+
+		skycell_asn r0099101???003*_*_cal.asdf  -o  r0099101001003001001 --product-type pass

pyproject.toml

@@ -91,6 +91,7 @@ schema_editor = "romancal.scripts.schema_editor:main"
 schemadoc = "romancal.scripts.schemadoc:main"
 verify_install_requires = "romancal.scripts.verify_install_requires:main"
 asn_from_list = "romancal.associations.asn_from_list:Main"
+skycell_asn = "romancal.associations.skycell_asn:Main" 
 
 [build-system]
 requires = [