Opts: Make singleton; senseApi: check senseApiLibPath, get senseApiDescFn pointer.

* OptionsParser now has a singleton.
* We now use the cmdline opt -p <senseApiLibPath>, and search for
  the specified library in:
  * senseApiLibPath, then CWD, then the place where our executable
    is running from, and then finally we let the hosting OS do
    its own search.
* We now call dlsym() on dlopen()'d libs to to get the senseApiDescFn
  pointer.

main.cpp

@@ -4,10 +4,11 @@
 #include <mind.h>
 #include <deviceManager/deviceManager.h>
 
+
 int main(int argc, char **argv)
 {
 try {
-	OptionParser options;
+	OptionParser &options = OptionParser::getOptions();
 	hk::Mind mind;
 
 	std::cout << PACKAGE_NAME << " " << PACKAGE_VERSION << std::endl;