Rewrote memory tracking, now prints highest water mark (most used memory at a given...

Rewrote memory tracking, now prints highest water mark (most used memory at a given time during compile). Changes all byte representation to MB representation. Added ability to print the contents of the leaked memory to the console when -debug is on (infact the lost messages only print during -debug), -memchk simply reports the memory info at the end (it is also printed when -debug). You can set the memory dump columns with -memdumpcols=# where # is the number of columns you want (default is 16)