* bugfix: do not ignore option for case-insensitivity when searching
for packing list files
* added "-b something" option to simulate -f '/something$', since I got
tired of typing the later
Portsearch allows searching for ports that install some file, like
``find /usr/ports -name pkg-plist |xargs grep pattern''
but honoring PLIST_(FILES|DIRS) and %%FOOBAR%% variables.
Approved by: garga (mentor)