seq, a simple MIDI file player and recorder

Several features are still missing in cyclone's seq.  The most important is, probably, handling of MIDI system exclusive messages.  Cyclone's seq suffers from various incompatibilities, and lack of extensive testing.

There are some incompatible additions, too:

• cyclone's seq loads multi-track files (but merges all tracks into one);
• supports messages pause and continue;
• supports random access:  the message goto <score-time-in-seconds> with optional second argument for extra precision, <offset-in-ms>;
• reports current score time (message scoretime);
• current directory for reading files may be specified (as absolute or relative path argument in message cd) and queried (message pwd);
• when clicked at, presents a text editor window for examining and modifying an event list.