explicit syslog_limit reduces danger of low-level message flooding; tuned;

retain original "uses" (again) -- still required for Thy_Load.use_file etc. in ML (notably for maintaining required/provided); tuned;

clarified scope of exception handlers;

relevant timing as in ML; more PIDE modules;

more fundamental pred-to-set conversions for range and domain by means of inductive_set

merged

tuned whitespace

tuned import

dropped dead code

terminate after first exception -- avoid syslog flooding;