Add the ability to read filelog output from a text file.
This functionality (if used; it's off by default) causes FLC to
try to find required filelog output from a specified file before
it queries the server. This can be used to fill in gaps (eg
obliterated files), or more importantly, to draw graphs based
on filelog output from a server you don't have access to, such
as when trying to diagnose an integration problem for a customer.
The filelog-parsing code hasn't been changed much, and isn't
very fault-tolerant, so it might crash if fed mangled filelogs.
Let the user beware.