Old code had problems with trailing space--which did not manifest itself
until now when I tried to use infix query (e.g. 'foo%sbar' would always
result in space after '%s').

Turns out that `read` with multiple variables splits the line just as we
need it with no extra leading/trailing junk.

Make them shorter but also sortable (ie. 'conv' for converters, 'flt'
for filters.)

Preserve lowercase matching in query mode (not in bookmark mode).

To maintain safety of colision and reflect purpose ('ffoo/saturnin_www.sh'
vs. 'libexec/saturnin-www.sh'), adding prefix 'saturnin_'.