Adding more flags to 'btrace' and 'btracer' launchers

Fixes #106 

This patch adds the following flags to "btrace" launcher:
* **-v**                Run in verbose mode
* **-u**                Run in unsafe mode
* **-d <path>**    Dump the instrumented classes to the specified path
* **-pd <path>**  The search path for the probe XML descriptors

"btracer" launcher is enhanced by:
* **-v**                Run in verbose mode
* **-u**                Run in unsafe mode
* **-p <port>**    BTrace agent server port
* **-o <file>**      The path to a file the btrace agent will store its output
* **-d <path>**    Dump modified classes to the provided location
* **-pd <path>**  Search for the probe XML descriptors here
* **--noserver**   Don't start the socket server
* **--stdout**       Redirect the btrace output to stdout instead of writing it to an arbitrary file
* **-bcp <cp>**   Append to bootstrap class path
* **-scp <cp>**   Append to system class path
* **-h**                Help