Deep nesting overflowed the stack of the recursive Pidgin parser (around
400-700 levels), an uncatchable crash. The depth is now checked on the token
stream before parsing and reported as a syntax error. Listed in PLAN 6.2 and
USAGE.
- macOS: document open -n -a with an absolute path (plan updated accordingly)
- package.sh: zip with 7z for '/' entry separators; ad-hoc codesign failure is a warning
- USAGE: list blank and unrepresentable paths as invalid arguments