Nicer timestamps in mpra logs, better make_pidfile().
Renaming cvtool.py to cv.py (which requires update to .gitignore),
adding crawl_setup to initialize symlinks so commands are available
without '.py' at the end.
- Generic simplug for all the plugins to use in crawl_lib.py.
  cv is using it.
- Addressed the Dimension initialization bug.
- Just let CrawlDBITest.py load the default config for mysql access
  info rather than trying to insist on 'crawl.cfg'.
- In CrawlPluginTest.py, send logs to a test log file, not the real
  one. Adjust where CrawlPluginTest thinks its test directory is.
- Use the common simplug code in tcc and mpra.
- Rename tcc plugin to follow the convention (still need to rename tcc-common).
- Renamed tcc_common.py to tcc_lib.py.