Run correctly in root or env conda environment

[jeanconn]

Run correctly in root or env conda environment. See

#302 (comment)

and following comments. This may end up being a skare3 issue, but I'm going to track it here for now.

[taldcroft]

AFAIK (and this could easily be wrong), starcheck is the only Ska3 app that needs a SKA_ROOT. Some ideas to discuss:

1. Define SKA_ROOT on-the-fly in starcheck/src/starcheck as below. Not clear if this is robust or if there is a more elegant way.

PYTHON_EXE=`which python`
SKA_BIN=`dirname $PYTHON_EXE`
SKA_ROOT=`dirname $SKA_BIN`

2. Define $CONDA_PREFIX in ska_envs.* so that this guaranteed to be defined in both "production" and "standalone env" environments. I'm less keen on this.
3. Is there some post-activate conda hook we can use to define SKA_ROOT?

If (1) works and there are no other applications that need SKA_ROOT then I'd vote for that.

[jeanconn]

I think this is done.