Halt astrometery delivery cycle per release coordinator's request. (#126)

It will need to be restarted from scratch when the astrometry changes are to be re-introduced. The directory is preserved for the time being with a 'HALTED' identifier for reference.

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diff --git a/caldp/astrometry-HALTED/README.md b/caldp/astrometry-HALTED/README.md
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+# Installing
+
+Currently, conda is required to manage installation of the enviornment. A fresh
+installation of Anaconda3 or Miniconda3 is not required for each HCALDP release,
+however.  An existing conda installation may be used. The method described here
+allows for multiple, entirely segregated, pipeline installations.
+
+A `bash`-compatible shell is required for all steps below.
+
+Python dependencies are now taken directly from PyPI or development repositories as
+needed, so conda's ability to install hybrid conda/pip environments from a YAML
+specification is used. This requires first downloading the specification file
+and then creating the environment with it.
+
+## For existing conda installations:
+
+### Install the pipeline environment
+
+```
+$ curl -O https://ssb.stsci.edu/releases/caldp/astrometry/latest-linux.yml
+$ conda env create -n caldp_astrometery --file latest-linux.yml
+```
+
+
+### Activate the pipeline environment
+
+```
+$ source activate caldp_astrometry
+```
+
+Each new delivery iteration of the calibration environment will need to be
+installed using the above commands.
+
+------
+
+## If conda is not yet installed
+
+If the conda tool is not available on the target system, it will need to be
+installed before the calibration environment can be installed.
+
+### Installing conda
+
+For detailed instructions of this step, please visit: http://docs.continuum.io/anaconda/install#linux-install
+
+**Miniconda:**
+
+```
+$ wget https://repo.anaconda.com/miniconda/Miniconda3-py37_4.8.2-Linux-x86_64.sh
+$ bash Miniconda3-py37_4.8.2-Linux-x86_64.sh
+$ export PATH=$HOME/miniconda3/bin:$PATH
+```
+
+**Anaconda (if preferred):**
+
+```
+$ wget https://repo.continuum.io/archive/Anaconda3-2019.10-Linux-x86_64.sh
+$ bash Anaconda3-2019.10-Linux-x86_64.sh
+$ export PATH=$HOME/anaconda3/bin:$PATH
+```
+