util: athena-run: use tmp directory, fix filetype

[MacroLens]

Change athena-run shell script to use the system's tmp directory rather than the ATHENA_HOME directory. Installing athena to ATHENA_HOME that is not writeable to all users, i.e. installing athena as a shared application, makes the athena-run script useless. By using the system's tmp directory you are able to write the temporary file needed without having write access to ATHENA_HOME.

Fixes a filetype issue when trying to load a .ath file with athena-run. Using athena-run with example.ath results in athena loading example.ath.ath. Which is unintended behavior.

[WilfredTA]

Thanks for this.

The change to using system's tmp directory will break some 3rd party tooling that uses Athena. I think a backwards compatible option, which first tries ATHENA_HOME and, upon failure, utilizes system tmp directory is therefore preferred here.

I do agree with the update to allow athena-run to accept file names regardless of whether or not the input includes the .ath extension.