sreal.h (SREAL_PART_BITS): Change to 31; remove seemingly unnecessary comment that it has to be even number.


	* sreal.h (SREAL_PART_BITS): Change to 31; remove seemingly unnecessary
	comment that it has to be even number.
	(class sreal): Change m_sig type to int32_t.
	* sreal.c (sreal::dump, sreal::to_int, opreator+, operator-): Use
	int64_t for temporary calculations.
	(sreal_verify_basics): Drop one bit from minimum and maximum.

From-SVN: r263981