v2.8.3: Maintenance update

Fixed bug in Scheduler that could cause a crash in case more than 128 very similar hands were solved in one invocation. If you didn't experience crashes, you don't have to upgrade for this bug fix.

Generalized the AnalysePlay functions. Previously they required a complete 13-trick hand with no cards played in a partial trick. Now they work for any number of remaining tricks and for partial tricks as well.

Included Pierre Cossard's code for using GDC multi-threading with Apple's LLVM compiler on the Mac.

Added a Makefile for compiling a shared library on the Mac.

Added a GetDDSInfo interface function that can be used to ask the DLL how it was compiled and how many threads it is using.

Modified the documentation names not to include the version number in the file names (easier to maintain).

Updated the documentation to fix an error (the playTracePBN structure uses an array of chars, not an array of ints; this was correct in dll.h). Also described pass as a valid par score.