switch Makefile to zsh and require zsh installation for developers #49
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The biocommons Makefile had been using globstar for the clean* targets. This was much more reliable/less error prone/easier to read than find | xargs. However, Apple only installs bash v3 on Macs because of licensing concerns with bash v4. So, our options were:
Since this matter only is only relevant to developers, and because zsh is either already installed or easily installed on modern systems, the easiest move seems to be to require that developers install zsh. That's what this PR does.