clarified frame parameters for ZSTD_compress*_usingCDict()

created ZSTD_compressBegin_usingCDict_internal(),
which gives direct control to frame Parameters.
ZSTD_resetCStream_internal() now points into it.

tests/paramgrill.c

@@ -58,6 +58,11 @@ static const int g_maxNbVariations = 64;
 **************************************/
 #define DISPLAY(...)  fprintf(stderr, __VA_ARGS__)
 
+#undef MIN
+#undef MAX
+#define MIN(a,b)   ( (a) < (b) ? (a) : (b) )
+#define MAX(a,b)   ( (a) > (b) ? (a) : (b) )
+
 
 /*-************************************
 *  Benchmark Parameters
@@ -145,8 +150,6 @@ typedef struct
 } blockParam_t;
 
 
-#define MIN(a,b)  ( (a) < (b) ? (a) : (b) )
-
 static size_t BMK_benchParam(BMK_result_t* resultPtr,
                              const void* srcBuffer, size_t srcSize,
                              ZSTD_CCtx* ctx,
@@ -513,8 +516,6 @@ static BYTE g_alreadyTested[PARAMTABLESIZE] = {0};   /* init to zero */
     g_alreadyTested[(XXH64(sanitizeParams(p), sizeof(p), 0) >> 3) & PARAMTABLEMASK]
 
 
-#define MAX(a,b)   ( (a) > (b) ? (a) : (b) )
-
 static void playAround(FILE* f, winnerInfo_t* winners,
                        ZSTD_compressionParameters params,
                        const void* srcBuffer, size_t srcSize,