* source/compiler/harbour.l
+ Added token "optional"
* source/compiler/harbour.y
+ Added token "optional", DecParam, DecParamList, OptParams.
+ Added support for optional parameters syntax in declared functions.
* source/compiler/harbour.c
+ Added logic in hb_compVariableAdd() to deal with optional parameters of declared functions.
* source/compiler/hbpcode.c
+ Added logic in hb_compStrongType() to deal with optional parameters of declared functions.
* tests/testwarn.prg
+ Added code to demonstrate usage and warnings of optional parameters in declared functions.
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