Get http

This pull request primarily changes the default behaviour of VOS GETs to use HTTP rather than HTTPS, although the old (secure) behaviour can be re-activated using the "--secure_get" option to mountvofs.

There are also some fiddles to the "vofsRandomAccessTest" test for benchmarking random access performance. In order to get this to work properly on my workstation the main change was to alter wc so that it uses "-c" instead of "-w". Therefore be wary of comparisons with past tests...

Finally, I re-ran the unit tests and came across a small error that was introduced in VOFile in 2cd3e20506e0. The constructor was changed so that a copy of URLs is no longer made, so the object can modify the caller's copy. The constructor now does a deep copy of the input URLs.