stubby crontab_setuid helper
Makefile: add target for in-tree testing
first working setuid helper
make "crontab -r" use setuid helper
align messages for "crontab -r"
add helper support to "crontab -l"
add helper support to "crontab -e"
add helper support to crontab/replace
update docs
avoid magic numbers & break on disk full
avoid local DOS: filling up /var
keep setuid 'r' & 'w' in sync
chmod crontabs 0600
bump version
fix chown