Add ability to write analysis data to alternate directory

[mdwood-intel]

Current implementation writes all analysis output to files and directories in the CWD, and post_process.py expects all inputs to be in CWD. It may be undesirable to write results to a test run directory.

Add option to pintool that allows specification of an alternate directory where results should be generated. Ideally, post_process.py should accept a directory where analysis data can be found, but that is less critical.