Lua math.random and math.randomseed replaced with our own version based on redisSrand48(). Seed initialized to the same value at every EVAL/EVALSHA call.

libc neutral random function derived from a drand48() implementation added. Will be used to replace Lua's math.random implementation.

rioInitWithFile nad rioInitWithBuffer functions now take a rio structure pointer to avoid copying a structure to return value to the caller.

make sure to return just 1 for rio.c write when the target is a buffer, as we do when the target is a file.

comment on top of the _rio structure modified for correctness as actually fwrite/fread semantics is different in general, but was 0/1 in our old usage before rio.c as we always used 1 as number items, and the actual number of bytes to read as item length.

redis-cli segfaults with single numeric argument greater than zero

fixed a small bug that caused redis-cli to segfault when given single numeric parameter greater that zero.

Spelling fixes.

Corrected typo in documentation for R_Zero, R_PosInf, R_NegInf, R_Nan;

Fixed compilation on Mac/PPC

[issue 620] don't segfault if number of arguments is less than 1

Emit a log message when AOF fsync is still in progress but we are forced to write from the main thread since two seconds already elapsed.

fixed flushAppendOnlyFile() function prototype to reflect the new implementation, fixing compilation.

Added aof_backgronud_fsync() function, and use it in the bacground rewrite done handler when the fsync policy is everysec.

fixed a problem in bioOlderJobType() when there are no jobs of the specified type. Now the function returns 0 when this happens.