Update fiops-iosched.c

Incrementing "service_tree" counter fixes the compilation error "Warning: Statement with no effect"
Update fiops-iosched.c

Increments "dispatched"line 296.
'+' was missiong line 421.
Update blk.h

Added code for IOPS
Update iocontext.h

Adding code for IOPS

"struct cfq_io_context" should be cleaned. New definition of struct cfq_io_context:
struct cfq_ttime {
        unsigned long last_end_request;
        unsigned long ttime_total;
        unsigned long ttime_samples;
        unsigned long ttime_mean;
};

struct cfq_io_context {
        struct dev_io_context dev_ioc;
        struct cfq_queue *cfqq[2];
        struct cfq_ttime ttime;
};
Update blk-ioc.c
Update cfq-iosched.c
Update blk_types.h

Definitions of REQ_PRIO" for cfq-iosched.c
Update iocontext.h
Merge pull request #6 from mat2057/patch-1

Updates for FIOPS

*) We do not use either CFQ or FIOPS by default, so this shouldn't cause conflicts