ttools: taplint tries not to truncate TAP_SCHEMA.columns table

taplint reads the columns from TAP_SCHEMA.columns to compare with
those declared from the tables metadata endpoint.  However for services
with large column counts, this was getting truncated, so it looked like
a discrepancy.  Avoid this (reasonably, but not totally reliably) by
setting MAXREC high enough.
ttools: taplint reports I[nfo] not F[ail] for missing ObsCore