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Entites which were a substring match of other entities in name (possible
in HTML 4 but not previously) would get mismatched in HTML (the shorter
always being picked and extra letters left over getting spat out to the
page). Solved by having a seperate try-first table of substring matching
entities.

New feature (sort of). Entities in URLs were never escaped as the
existing relaxed entity parser would often mangle CGI-style URLs. There
is now a strict unescaping mode used for URLs which seems to sort out
various sites where this was a problem.

Makefile exports to 'Lib$Dir' rather than 'HTMLLib:' to fit in with
current build environments.