Added skeleton code for processing blk_io_queue events.

[ADD]: New files for each event.
[ADD]: Init, Handler & Finalize function declarations and
	minimal definitions.
[UPDATE]: Updated Trace.h with new blk_io events macros.
[ADD]: Added new extern struct declarations to Externals.
Updated Makefile with new rules
Updated with new declarations
Added skeleton code for handling lost_records event
Updated main with event registartions
Added code to compute wait time(front-shared-q).

[ADD]: Updated Handler methods for both Block/Unblock
	events to keep track of total wait time.
[UPDATE]: Makefile rules, extern declarations, Event macros.
"Added event handler code for front-req-q.

[ADD]: Handler code to compute total wait time
	req queue spent unblocked.
Handler code for total time back-req-q was unblocked.
Helper functions for finding total time.

[ADD]: Added new functions to retrieve first and last seen
	time stamps for any given cpu in the log.
Code to track and print total log time.

[ADD]: Init, Compute & free functions for calculating total
	time spent in each CPU.
Print total time.

[UPDATE]: Print total time collecting logs.
[UPDATE]: Makefile rules for new files.
Fixed lost_rec calculation and print new data.

[FIX]: Fixed code to use last cpu record time not last
	record time.
[UPDATE]: Print lost_record stats
Bug fixes for lost_rec and events.

[FIX]: Fixed lost_rec to handle edgae cases.
[FIX]: Fixed terminating condition in loop.
Fix for front shared ring queue wait time.

[FIX]: Fix edge case: no block msg at the start of log.
Track & print lost time by cpu

[ADD]: New funcs and structs to keep track of lost (records,time,occurences)
	by cpu.
Print total log time by CPU
Print % of lost time
Avg CPU and each CPU time calculations.

[ADD]: Added new functions to calculate avg
	time spent collecting logs.
[ADD]: Print individual CPU times.
Changed lost_rec handling behavior.

Retain analysis data across multiple lost_rec events,
only reset local temporal data.
Modified wait time calculation

Calculate wait times between unblock and a
lost_rec event instead. See comments inline for
more.