clarified Trace_Ops: global theory data avoids init of simpset in Pure.thy, which is important to act as neutral element in merge;

skeleton for Simplifier trace by Lars Hupel;

generic trace operations for main steps of Simplifier;

tuned signature;

tuned whitespace;

added missing file (cf. 124432e77ecf);

tuned whitespace;

removed dead code -- ctxt is never visible (see also 658fcba35ed7);

simplified polyml-5.5.2 setup -- implicit upgrade of Thread.numProcessors;

tuned message;

be more explicit about pre- and postprocessor, particularly code_abbrev

removed obsolete codegen setup; Stream -> SCons; tuned

merged

tuned patterns;

support for polml-5.5.2; support Thread.numPhysicalProcessors of polyml-5.5.2 (according to SVN 1890); clarified max_threads: store plain value internally, reproduce result only on startup, and thus avoid potential system overhead;