Move pat.py out of $PATH
patrc: Add emacs sh-mode local variable
pat: test debug in main
pat: Reword stdout messages
pat: Make $PAT_WORKING_DIR if necessary
pat.py: Add logging and debugging
pat.py: keep cache file mod 0600
pat.py: fix function description comment
pat.py: fix mail finding
patrc: Reduce poll time to 20 s
pat: add --log command
make: change patrc mod 0755 -> 0644
pat.py: change new mail notification summary
pat.py: Break after first match for ^From:\s+
Revert "patrc: Reduce poll time to 20 s"

This reverts commit 9bf096e00f5f4368e7ec595e22ae6f02164fda71.
pat: Don't advertise orphan lock removal