Previously we needed to include headers required by the various
sudo*h files. Now those files are more self-sufficient and we
should only include headers needed by code in the various .c files.
1) don't assume snprintf() returns -1 on error, check for <0
2) when comparing return value of sizeof(foo), cast the sizeof, not the len
3) cast return value to void in cases where snprintf cannot fail
Currently forces alias expansion when a filter is applied and the
entire matching user or host list is printed, even the non-matching
entries. This effectively allows you to grep sudoers by user, group
and host.
