Add {PLUS_NUM} string code which includes leading + for positive values

src/table/strgen_tables.h

@@ -111,6 +111,7 @@ static const CmdStruct _cmd_structs[] = {
 	{"DECIMAL",           EmitSingleChar, SCC_DECIMAL,            2,  0, C_NONE}, // Number with comma and fractional part. Second parameter is number of fractional digits, first parameter is number times 10**(second parameter).
 	{"DECIMAL1",          EmitSingleChar, SCC_DECIMAL1,           1,  0, C_NONE}, // Decimal with fixed second parameter of 1
 	{"NUM",               EmitSingleChar, SCC_NUM,                1,  0, C_NONE}, // Signed number
+	{"PLUS_NUM",          EmitSingleChar, SCC_PLUS_NUM,           1,  0, C_NONE}, // Signed number, with sign (+ or -) shown for both positive and negative numbers
 	{"ZEROFILL_NUM",      EmitSingleChar, SCC_ZEROFILL_NUM,       2,  0, C_NONE}, // Unsigned number with zero fill, e.g. "02". First parameter is number, second minimum length
 	{"BYTES",             EmitSingleChar, SCC_BYTES,              1,  0, C_NONE}, // Unsigned number with "bytes", i.e. "1.02 MiB or 123 KiB"
 	{"HEX",               EmitSingleChar, SCC_HEX,                1,  0, C_NONE}, // Hexadecimally printed number