Use spaces instead of tabs in QueryParser.pm

Use spaces instead of tabs in QueryParser.pm

Copying swathes of SQL from logs into psql would often trigger the
autocompletion that psql offers, garbling a query awfully. Define the
local $spc var as two spaces and use that instead, leaving open the
option for reverting to tabs or anything else people prefer.

Also remove trailing whitespace, as this whole thing is about space.

Signed-off-by: Dan Scott <dan@coffeecode.net>