A bunch of cleanups to make profiling possible again, and easier.
"make quickprof-CMD" generates a profile for CMD, which must be one
word and runs against one of the sample journals (the usual
quickprof-"SOME WORDS" quoting trick isn't working here for some
reason)
Also,
"make hledgerprof" builds the hledgerprof executable (in stack's bin dir) for profiling.
"make hledgercov" builds the hledgercov executable (in ./bin) for coverage reports
(renamed from hledgerhpc to remind me that HPC is nothing to do with heap coverage)
